BackerKits WIP rails4 gemfile, for trying to track down this: https://github.com/rails/rails/issues/10507 If you see this bug, share your Gemfile and maybe we can figure out where this is happening.

Gemfile

source 'https://rubygems.org'


ruby '2.0.0'

gem 'rails', '4.0.0'

gem 'rails_autolink'
gem 'protected_attributes'

#database + extensions
gem 'pg'
gem 'pg_search'

#rails 4 stuff
gem 'jquery-rails'
gem 'jquery-ui-rails'
gem 'rails-backbone'
gem 'marionette-rails'

#deploy and config
gem 'figaro'

gem 'foreman'

gem 'groupdate'
gem 'chartkick'
gem 'faker'

# background worker stuff
gem 'sidekiq'
gem 'sidekiq-failures'
gem 'sinatra', :require => nil

gem 'slim'
gem 'rack-rewrite'

gem 'redis-store', github: 'jodosha/redis-store'
gem 'redis-rails', '> 3.2.1'

#authentication
gem 'devise', '3.0.0rc'
gem "devise-async"

#file uploads
gem 'rmagick'
gem 'carrierwave'
gem 'fog', '~> 1.3.1'

gem 'prawn'
gem 'ranked-model', github: 'mixonic/ranked-model'

# forms
gem 'simple_form', github: 'plataformatec/simple_form'
gem 'countries', github: 'hexorx/countries'
gem 'country_select'
gem 'honeybadger'

#misc
gem 'mechanize'
gem 'paper_trail', github: 'airblade/paper_trail', branch: 'rails4'
gem 'markerb'
gem 'newrelic_rpm'
gem 'stripe'

gem 'yajl-ruby'
gem 'active_model_serializers'

gem 'state_machine'

gem 'rack-google-analytics'

gem 'filepicker-rails', git: 'git://github.com/BackerKit/filepicker-rails.git'
gem 'omniauth-stripe-connect'

gem 'puma'

gem 'will_paginate'
gem 'intercom-rails'


gem 'faraday'
gem 'faraday_middleware'
group :development do
  gem 'heroku_san'
  gem 'guard-spork'
  gem 'guard-rspec'
  gem 'quiet_assets'
  gem 'rb-fsevent'
  gem 'better_errors'
  gem 'binding_of_caller'
  gem 'meta_request'
  gem 'oink'
  gem 'mailcatcher'
end

group :test, :development do
  gem 'rspec-rails', '~> 2.0'
  gem 'capybara'
  gem 'rspec-instafail'
  gem 'debugger'
  gem 'spork-rails', github: 'railstutorial/spork-rails'
  gem 'jasmine'
  gem 'database_cleaner'
  gem 'launchy'
  gem 'fuubar'
  gem 'pry'
  gem 'pry-debugger'
  gem 'method_info'
end

group :test do
  gem 'factory_girl_rails', '~> 4.0'
end

gem 'sass-rails',   '~> 4.0.0.rc1'
gem 'coffee-rails', '~> 4.0.0'
gem 'uglifier', '>= 1.3.0'

gem 'bootstrap-sass', '~> 2.3.0.1'
gem 'font-awesome-sass-rails' 
gem "asset_sync"

gem 'handlebars_assets', '0.12.3'

Gemfile.lock

GIT
  remote: git://github.com/BackerKit/filepicker-rails.git
  revision: 2028d679dfbe7eeb591782e58aa4d5caa9e64c93
  specs:
    filepicker-rails (0.1)
      multi_json (~> 1.6)
      railties (>= 3.1.0, < 5.0)

GIT
  remote: git://github.com/airblade/paper_trail.git
  revision: e1d590fe16cb6072dd3a5e6b42e64476c4d14acb
  branch: rails4
  specs:
    paper_trail (2.7.2)
      activerecord (>= 4.0.0.beta, < 5.0)
      railties (>= 4.0.0.beta, < 5.0)

GIT
  remote: git://github.com/hexorx/countries.git
  revision: adaa87edd0f6ce99f512bbc5ad830e32fc70e508
  specs:
    countries (0.9.1)
      currencies (~> 0.4.2)

GIT
  remote: git://github.com/jodosha/redis-store.git
  revision: f445272b30ae3030b942a9a10681c2672d04b39b
  specs:
    redis-actionpack (3.2.3)
      actionpack (>= 3.2.3)
      redis-rack (~> 1.4.0)
      redis-store (~> 1.1.0)
    redis-activesupport (3.2.3)
      activesupport (>= 3.2.3)
      redis-store (~> 1.1.0)
    redis-rack (1.4.2)
      rack (~> 1.4)
      redis-store (~> 1.1.0)
    redis-store (1.1.3)
      redis (>= 2.2)

GIT
  remote: git://github.com/mixonic/ranked-model.git
  revision: 8683040676aa576f993d10169faf204ef622c815
  specs:
    ranked-model (0.2.1)
      activerecord (>= 3.1.12)

GIT
  remote: git://github.com/plataformatec/simple_form.git
  revision: 7b2aa6edcf367e300c3f1216b9d82e0230e7e8db
  specs:
    simple_form (3.0.0.rc)
      actionpack (>= 4.0.0.rc1, < 4.1)
      activemodel (>= 4.0.0.rc1, < 4.1)

GIT
  remote: git://github.com/railstutorial/spork-rails.git
  revision: 5db525af2f917047057f546bc1ac2574d1c6b11e
  specs:
    spork-rails (3.2.1)
      spork (>= 1.0rc0)

GEM
  remote: https://rubygems.org/
  specs:
    Ascii85 (1.0.2)
    actionmailer (4.0.0)
      actionpack (= 4.0.0)
      mail (~> 2.5.3)
    actionpack (4.0.0)
      activesupport (= 4.0.0)
      builder (~> 3.1.0)
      erubis (~> 2.7.0)
      rack (~> 1.5.2)
      rack-test (~> 0.6.2)
    active_model_serializers (0.8.1)
      activemodel (>= 3.0)
    activemodel (4.0.0)
      activesupport (= 4.0.0)
      builder (~> 3.1.0)
    activerecord (4.0.0)
      activemodel (= 4.0.0)
      activerecord-deprecated_finders (~> 1.0.2)
      activesupport (= 4.0.0)
      arel (~> 4.0.0)
    activerecord-deprecated_finders (1.0.3)
    activesupport (4.0.0)
      i18n (~> 0.6, >= 0.6.4)
      minitest (~> 4.2)
      multi_json (~> 1.3)
      thread_safe (~> 0.1)
      tzinfo (~> 0.3.37)
    addressable (2.3.4)
    afm (0.2.0)
    arel (4.0.0)
    asset_sync (0.5.4)
      activemodel
      fog
    atomic (1.1.9)
    bcrypt-ruby (3.0.1)
    better_errors (0.9.0)
      coderay (>= 1.0.0)
      erubis (>= 2.6.6)
    binding_of_caller (0.7.2)
      debug_inspector (>= 0.0.1)
    bootstrap-sass (2.3.0.1)
      sass (~> 3.2)
    builder (3.1.4)
    callsite (0.0.11)
    capybara (2.1.0)
      mime-types (>= 1.16)
      nokogiri (>= 1.3.3)
      rack (>= 1.0.0)
      rack-test (>= 0.5.4)
      xpath (~> 2.0)
    carrierwave (0.8.0)
      activemodel (>= 3.2.0)
      activesupport (>= 3.2.0)
    celluloid (0.14.1)
      timers (>= 1.0.0)
    chartkick (1.1.2)
    childprocess (0.3.9)
      ffi (~> 1.0, >= 1.0.11)
    coderay (1.0.9)
    coffee-rails (4.0.0)
      coffee-script (>= 2.2.0)
      railties (>= 4.0.0.beta, < 5.0)
    coffee-script (2.2.0)
      coffee-script-source
      execjs
    coffee-script-source (1.6.2)
    columnize (0.3.6)
    connection_pool (1.1.0)
    country_select (1.1.3)
    currencies (0.4.2)
    daemons (1.1.9)
    database_cleaner (1.0.1)
    debug_inspector (0.0.2)
    debugger (1.6.0)
      columnize (>= 0.3.1)
      debugger-linecache (~> 1.2.0)
      debugger-ruby_core_source (~> 1.2.1)
    debugger-linecache (1.2.0)
    debugger-ruby_core_source (1.2.2)
    devise (3.0.0.rc)
      bcrypt-ruby (~> 3.0)
      orm_adapter (~> 0.1)
      railties (>= 3.2.6, < 5)
      warden (~> 1.2.1)
    devise-async (0.7.0)
      devise (>= 2.2)
    diff-lcs (1.2.4)
    domain_name (0.5.12)
      unf (>= 0.0.5, < 1.0.0)
    dotenv (0.8.0)
    ejs (1.1.1)
    erubis (2.7.0)
    eventmachine (1.0.3)
    excon (0.13.4)
    execjs (1.4.0)
      multi_json (~> 1.0)
    factory_girl (4.2.0)
      activesupport (>= 3.0.0)
    factory_girl_rails (4.2.1)
      factory_girl (~> 4.2.0)
      railties (>= 3.0.0)
    faker (1.1.2)
      i18n (~> 0.5)
    faraday (0.8.7)
      multipart-post (~> 1.1)
    faraday_middleware (0.9.0)
      faraday (>= 0.7.4, < 0.9)
    ffi (1.9.0)
    figaro (0.6.4)
      bundler (~> 1.0)
      rails (>= 3, < 5)
    fog (1.3.1)
      builder
      excon (~> 0.13.0)
      formatador (~> 0.2.0)
      mime-types
      multi_json (~> 1.0)
      net-scp (~> 1.0.4)
      net-ssh (>= 2.1.3)
      nokogiri (~> 1.5.0)
      ruby-hmac
    font-awesome-sass-rails (3.0.2.2)
      railties (>= 3.1.1)
      sass-rails (>= 3.1.1)
    foreman (0.63.0)
      dotenv (>= 0.7)
      thor (>= 0.13.6)
    formatador (0.2.4)
    fuubar (1.1.1)
      rspec (~> 2.0)
      rspec-instafail (~> 0.2.0)
      ruby-progressbar (~> 1.0)
    groupdate (1.0.2)
      activerecord (>= 3.0.0)
    guard (1.8.0)
      formatador (>= 0.2.4)
      listen (>= 1.0.0)
      lumberjack (>= 1.0.2)
      pry (>= 0.9.10)
      thor (>= 0.14.6)
    guard-rspec (3.0.2)
      guard (>= 1.8)
      rspec (~> 2.13)
    guard-spork (1.5.0)
      childprocess (>= 0.2.3)
      guard (>= 1.1)
      spork (>= 0.8.4)
    haml (4.0.3)
      tilt
    handlebars_assets (0.12.3)
      execjs (>= 1.2.9)
      sprockets (>= 2.0.3)
      tilt
    hashery (2.1.0)
    hashie (2.0.5)
    heroku-api (0.2.1)
      excon (~> 0.13.3)
    heroku_san (4.2.5)
      heroku-api (>= 0.1.2)
      rake
    hike (1.2.3)
    hodel_3000_compliant_logger (0.1.1)
    honeybadger (1.7.0)
      json
    http-cookie (1.0.1)
      domain_name (~> 0.5)
    httpauth (0.2.0)
    i18n (0.6.4)
    intercom-rails (0.2.21)
      activesupport (> 3.0)
    jasmine (1.3.2)
      jasmine-core (~> 1.3.1)
      rack (~> 1.0)
      rspec (>= 1.3.1)
      selenium-webdriver (>= 0.1.3)
    jasmine-core (1.3.1)
    jquery-rails (2.1.4)
      railties (>= 3.0, < 5.0)
      thor (>= 0.14, < 2.0)
    jquery-ui-rails (4.0.3)
      jquery-rails
      railties (>= 3.1.0)
    json (1.8.0)
    jwt (0.1.8)
      multi_json (>= 1.5)
    launchy (2.3.0)
      addressable (~> 2.3)
    listen (1.2.1)
      rb-fsevent (>= 0.9.3)
      rb-inotify (>= 0.9)
      rb-kqueue (>= 0.2)
    lumberjack (1.0.3)
    mail (2.5.4)
      mime-types (~> 1.16)
      treetop (~> 1.4.8)
    mailcatcher (0.2.4)
      eventmachine
      haml
      i18n
      json
      mail
      sinatra
      skinny (>= 0.1.2)
      sqlite3-ruby
      thin
    marionette-rails (1.0.3)
      rails (>= 3.1.0)
    markerb (1.0.1)
      redcarpet (>= 2.0)
    mechanize (2.7.1)
      domain_name (~> 0.5, >= 0.5.1)
      http-cookie (~> 1.0.0)
      mime-types (~> 1.17, >= 1.17.2)
      net-http-digest_auth (~> 1.1, >= 1.1.1)
      net-http-persistent (~> 2.5, >= 2.5.2)
      nokogiri (~> 1.4)
      ntlm-http (~> 0.1, >= 0.1.1)
      webrobots (>= 0.0.9, < 0.2)
    meta_request (0.2.6)
      callsite
      rack-contrib
      railties
    method_info (0.1.11)
    method_source (0.8.1)
    mime-types (1.23)
    minitest (4.7.5)
    multi_json (1.7.7)
    multipart-post (1.2.0)
    net-http-digest_auth (1.3)
    net-http-persistent (2.8)
    net-scp (1.0.4)
      net-ssh (>= 1.99.1)
    net-ssh (2.6.7)
    newrelic_rpm (3.6.3.111)
    nokogiri (1.5.10)
    ntlm-http (0.1.1)
    oauth2 (0.8.1)
      faraday (~> 0.8)
      httpauth (~> 0.1)
      jwt (~> 0.1.4)
      multi_json (~> 1.0)
      rack (~> 1.2)
    oink (0.10.1)
      activerecord
      hodel_3000_compliant_logger
    omniauth (1.1.4)
      hashie (>= 1.2, < 3)
      rack
    omniauth-oauth2 (1.1.1)
      oauth2 (~> 0.8.0)
      omniauth (~> 1.0)
    omniauth-stripe-connect (2.2.0)
      omniauth (~> 1.0)
      omniauth-oauth2 (>= 1.0.3)
    orm_adapter (0.4.0)
    pdf-reader (1.3.3)
      Ascii85 (~> 1.0.0)
      afm (~> 0.2.0)
      hashery (~> 2.0)
      ruby-rc4
      ttfunk
    pg (0.15.1)
    pg_search (0.6.4)
      activerecord (>= 3.1)
      activesupport (>= 3.1)
      arel
    polyglot (0.3.3)
    prawn (0.12.0)
      pdf-reader (>= 0.9.0)
      ttfunk (~> 1.0.2)
    protected_attributes (1.0.1)
      activemodel (>= 4.0.0.beta, < 5.0)
    pry (0.9.12.2)
      coderay (~> 1.0.5)
      method_source (~> 0.8)
      slop (~> 3.4)
    pry-debugger (0.2.2)
      debugger (~> 1.3)
      pry (~> 0.9.10)
    puma (2.1.0)
      rack (>= 1.1, < 2.0)
    quiet_assets (1.0.2)
      railties (>= 3.1, < 5.0)
    rack (1.5.2)
    rack-contrib (1.1.0)
      rack (>= 0.9.1)
    rack-google-analytics (0.11.0)
    rack-protection (1.5.0)
      rack
    rack-rewrite (1.3.3)
    rack-test (0.6.2)
      rack (>= 1.0)
    rails (4.0.0)
      actionmailer (= 4.0.0)
      actionpack (= 4.0.0)
      activerecord (= 4.0.0)
      activesupport (= 4.0.0)
      bundler (>= 1.3.0, < 2.0)
      railties (= 4.0.0)
      sprockets-rails (~> 2.0.0)
    rails-backbone (0.9.10)
      coffee-script (~> 2.2.0)
      ejs (~> 1.1.1)
      jquery-rails (~> 2.1.3)
      railties (>= 3.1.0)
    rails_autolink (1.1.0)
      rails (> 3.1)
    railties (4.0.0)
      actionpack (= 4.0.0)
      activesupport (= 4.0.0)
      rake (>= 0.8.7)
      thor (>= 0.18.1, < 2.0)
    rake (10.1.0)
    rb-fsevent (0.9.3)
    rb-inotify (0.9.0)
      ffi (>= 0.5.0)
    rb-kqueue (0.2.0)
      ffi (>= 0.5.0)
    redcarpet (2.3.0)
    redis (3.0.4)
    redis-namespace (1.3.0)
      redis (~> 3.0.0)
    redis-rails (3.2.2)
      redis-actionpack (~> 3.2.2)
      redis-activesupport (~> 3.2.2)
      redis-store (~> 1.1.0)
    rest-client (1.6.7)
      mime-types (>= 1.16)
    rmagick (2.13.2)
    rspec (2.13.0)
      rspec-core (~> 2.13.0)
      rspec-expectations (~> 2.13.0)
      rspec-mocks (~> 2.13.0)
    rspec-core (2.13.1)
    rspec-expectations (2.13.0)
      diff-lcs (>= 1.1.3, < 2.0)
    rspec-instafail (0.2.4)
    rspec-mocks (2.13.1)
    rspec-rails (2.13.2)
      actionpack (>= 3.0)
      activesupport (>= 3.0)
      railties (>= 3.0)
      rspec-core (~> 2.13.0)
      rspec-expectations (~> 2.13.0)
      rspec-mocks (~> 2.13.0)
    ruby-hmac (0.4.0)
    ruby-progressbar (1.1.1)
    ruby-rc4 (0.1.5)
    rubyzip (0.9.9)
    sass (3.2.9)
    sass-rails (4.0.0.rc2)
      railties (>= 4.0.0.beta, < 5.0)
      sass (>= 3.1.10)
      sprockets-rails (~> 2.0.0)
    selenium-webdriver (2.33.0)
      childprocess (>= 0.2.5)
      multi_json (~> 1.0)
      rubyzip
      websocket (~> 1.0.4)
    sidekiq (2.12.4)
      celluloid (>= 0.14.1)
      connection_pool (>= 1.0.0)
      json
      redis (>= 3.0)
      redis-namespace
    sidekiq-failures (0.2.0)
      sidekiq (>= 2.2.1)
    sinatra (1.4.3)
      rack (~> 1.4)
      rack-protection (~> 1.4)
      tilt (~> 1.3, >= 1.3.4)
    skinny (0.2.3)
      eventmachine (~> 1.0.0)
      thin (~> 1.5.0)
    slim (2.0.0)
      temple (~> 0.6.5)
      tilt (~> 1.3, >= 1.3.3)
    slop (3.4.5)
    spork (1.0.0rc3)
    sprockets (2.10.0)
      hike (~> 1.2)
      multi_json (~> 1.0)
      rack (~> 1.0)
      tilt (~> 1.1, != 1.3.0)
    sprockets-rails (2.0.0)
      actionpack (>= 3.0)
      activesupport (>= 3.0)
      sprockets (~> 2.8)
    sqlite3 (1.3.7)
    sqlite3-ruby (1.3.3)
      sqlite3 (>= 1.3.3)
    state_machine (1.2.0)
    stripe (1.8.3)
      multi_json (>= 1.0.4, < 2)
      rest-client (~> 1.4)
    temple (0.6.5)
    thin (1.5.1)
      daemons (>= 1.0.9)
      eventmachine (>= 0.12.6)
      rack (>= 1.0.0)
    thor (0.18.1)
    thread_safe (0.1.0)
      atomic
    tilt (1.4.1)
    timers (1.1.0)
    treetop (1.4.14)
      polyglot
      polyglot (>= 0.3.1)
    ttfunk (1.0.3)
    tzinfo (0.3.37)
    uglifier (2.1.1)
      execjs (>= 0.3.0)
      multi_json (~> 1.0, >= 1.0.2)
    unf (0.1.1)
      unf_ext
    unf_ext (0.0.6)
    warden (1.2.1)
      rack (>= 1.0)
    webrobots (0.1.1)
    websocket (1.0.7)
    will_paginate (3.0.4)
    xpath (2.0.0)
      nokogiri (~> 1.3)
    yajl-ruby (1.1.0)

PLATFORMS
  ruby

DEPENDENCIES
  active_model_serializers
  asset_sync
  better_errors
  binding_of_caller
  bootstrap-sass (~> 2.3.0.1)
  capybara
  carrierwave
  chartkick
  coffee-rails (~> 4.0.0)
  countries!
  country_select
  database_cleaner
  debugger
  devise (= 3.0.0rc)
  devise-async
  factory_girl_rails (~> 4.0)
  faker
  faraday
  faraday_middleware
  figaro
  filepicker-rails!
  fog (~> 1.3.1)
  font-awesome-sass-rails
  foreman
  fuubar
  groupdate
  guard-rspec
  guard-spork
  handlebars_assets (= 0.12.3)
  heroku_san
  honeybadger
  intercom-rails
  jasmine
  jquery-rails
  jquery-ui-rails
  launchy
  mailcatcher
  marionette-rails
  markerb
  mechanize
  meta_request
  method_info
  newrelic_rpm
  oink
  omniauth-stripe-connect
  paper_trail!
  pg
  pg_search
  prawn
  protected_attributes
  pry
  pry-debugger
  puma
  quiet_assets
  rack-google-analytics
  rack-rewrite
  rails (= 4.0.0)
  rails-backbone
  rails_autolink
  ranked-model!
  rb-fsevent
  redis-rails (> 3.2.1)
  redis-store!
  rmagick
  rspec-instafail
  rspec-rails (~> 2.0)
  sass-rails (~> 4.0.0.rc1)
  sidekiq
  sidekiq-failures
  simple_form!
  sinatra
  slim
  spork-rails!
  state_machine
  stripe
  uglifier (>= 1.3.0)
  will_paginate
  yajl-ruby