Grails 2.3 breakpoints

I've always had luck setting breakpoints and debugging Grails with Intellij but with the latest Grails (2.3 RC1 and RC2) I'm unable to hit the breakpoints I've set. I've tried a few different versions of Intellij: 12.1.4 and EAP 130.1619 and 132.27. What's odd is that the breakpoint icon remains a solid red circle - no checkmark or x. Is it possible that its not locating the associated class files?

Thanks!

Tom