When I first start eclipse and try to debug something, the debugger works fine except for the variables are not displayed. If I restart eclipse then start debugging, everything works perfectly.
Have you configured displaying variables thorugh the context menu of the Variables view? These options only become enabled after the EPIC debugger has been started (unfortunately).
Jan is right.. I missed checking the kind of variables to monitor (local, global et al) in the context menu and kept restarting eclipse for quite sometime :P