evaluating groovy Geb expressions in Spock specs with IDEA 11.0.1

Spock support got better in IDEA 11, as it now provides the option of running integration and functional specs in Grails as well as straight JUnit.  But, I seem to be having problems now with something that was great in IDEA 10.  When I debugged a Geb spec, I could evaluate dynamic stuff like $('form'), exploring the remote browser DOM via Geb's Groovy default properties and methods.  It was on par with debugging in Selenium IDE.

Now, when I debug with IDEA 11, the expression evaluation only works in Java mode.  When I set it to Groovy mode, I just get "No such instance method: 'java.lang.Class.getMetaClass'".  I don't know how to get to the Groovy Geb stuff anymore.  I guess that Spock is recompiling the specs into Java, and that's somehow breaking the debugger's Groovy support?  Or maybe I'm just not doing it like I was before?  It's been a while.  I tried debugging in both JUnit and Grails.  Has anyone else run into this?  Debugging other Groovy stuff in Grails works fine.