If you're using Edge Rails and mongrel you might have seen this error:
warning: already initialized constant OPTIONS
There's a bug report here that explains this problem in detail.
The solution for me was to rerun the freeze command:
You might also get "warning: already initialized constant OPTIONS" error if you haven't installed a gem your software relies on. In the following example openssl should be installed:
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in gem_original_require’: no such file to load—openssl (MissingSourceFile)
ActiveResource might also be the problem:
gem install activeresource --source http://gems.rubyonrails.org