I found this error in the console log: ApplicationController#awakeFromNib: SystemStackError: stack level too deep
Happens in /Library/Frameworks/RubyCocoa.framework/Resources/ruby/osx/objc/oc_attachments.rb
In a call that originates from:
/Applications/GitNub.app/Contents/Resources/ApplicationController.rb:55:in 'awakeFromNib'