This is an OS X Homebrew install, with rbenv root in /usr/local/var/rbenv; 
Ruby 2.0.0, and Rails 4.0.0.  'gem install rails' went without complaint. 
Then I tried to run 'rails new hypothetical_app'. That, and all calls to 
the rails app, show that app_rails_loader is finding a *directory*bin/rails 
where it expects to find a 
*file* bin/rails:

>
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/railties-4.0.0/lib/rails/app_rails_loader.rb:34:inread':
>  
> Is a directory - bin/rails (Errno::EISDIR)
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/railties-4.0.0/lib/rails/app_rails_loader.rb:34:in
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/railties-4.0.0/lib/rails/app_rails_loader.rb:34:inblock
>  
> in exec_app_rails'
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/railties-4.0.0/lib/rails/app_rails_loader.rb:32:in
> loop'
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/railties-4.0.0/lib/rails/app_rails_loader.rb:32:in
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/railties-4.0.0/lib/rails/app_rails_loader.rb:32:in
> exec_app_rails'
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/railties-4.0.0/lib/rails/cli.rb:6:in<top
>  
> (required)>'
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in
> require'
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in
>  
> require'
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/railties-4.0.0/bin/rails:9:in
> from 
> /usr/local/var/rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/railties-4.0.0/bin/rails:9:in
> '
> from /usr/local/var/rbenv/versions/2.0.0-p195/bin/rails:23:in load'
> from /usr/local/var/rbenv/versions/2.0.0-p195/bin/rails:23:in
> from /usr/local/var/rbenv/versions/2.0.0-p195/bin/rails:23:in'

Aside from not setting my rbenv root to ~/.rbenv, I can't think of any 
departures I have made from completely standard installation of everything.

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