This has started occurring after installing Visual Studio 2015 Update 1. Invoking the CodeRush Find All References shows the references window, and immediately a message box saying:
The type initializer for 'DevExpress.CodeAnalysis.LanguageFeatures' threw an exception.
Pressing "Ok" leaves the references window with a progress bar saying "Searching" and no references are displayed.
Thanks for your report. We are informed that the current CodeRush for Roslyn version has compatibility issues with Visual Studio Update 1. We are working to solve them in the next update. You will be automatically notified of our progress.