Same issue, started yesterday for no apparent reason, and I can't think of any system changes I've made (or OS updates).
FB 4.5.1, Mac OS X 10.6
Tried new and existing projects, everything blank.
Oh, holy hell. Looks (at least at first glance) like this is the issue. Should've never let that very-old Firefox profile update itself.
(essentially, it says to fix your mm.cfg file to zap some idiot entry that FlashFirebug put there)
yap, it solved the problem.
thanks a lot.
thanks !! it did solved the problem! FlashFireBug gives a lot of problems when developing with FB
Apparently, FlashFirebug just straight up destroys everything Adobe-related on the system. I discovered this after a lot of searching for why Fireworks CS5.1 won't fully launch under Lion. Apparently, it also messes up Extension Manager.
For future use for anyone who finds this:
Extension Manager Crashes; fails to start
Fireworks CS5.1 Crashes; fails to start
see link above for solution; remove flashfirebug.cfg to resolve.
I didn't even realize I still had it on my system after the previous fiasco. Probably an infrequently-used FF profile.
Does anyone know if this is a known Adobe issue, and if not, does anyone have a suggestion about how to classify the bug report?