Not sure if it will help, but try righ-clicking on the project folder and selecting "Apply CF nature."
nah, tried that. i think it might be because I have had so many different plugins installed into that version of eclipse. Did the stand alone version and all is well. Subclipse and Mylyn are there as well
well, I found some notes about installing CFB plugin on a mac. Use the "Carbon" version of eclipse (version 3.5) and all my woes were gone.