Failed to load remote gems: stack level too deep (SystemStackError)
Looks like some problem with the gem hosting servers, you will get the same behavior in the terminal:
% gem list --remote --all*** REMOTE GEMS ***/Users/denofevil/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/spec_fetcher.rb:170: stack level too deep (SystemStackError) In RubyMine you can disable these pop-ups in Settings | Notifications | Gem Manager, set to Ignore.
UPDATE: We've filed a bug for this problem to rubygems project.
UPDATE 2: The issue is resolved in RubyGems 1.8.6, run gem update --system to get the latest RubyGems version.