DeaconBlues ... already tried the cleanup? factory reset? I usually have one default VST, Halion Sonic, sometimes sforzando ... so about these others mentioned i have no clue ... maybe you can pinpoint the culprit by soloing, or removing one by one ...
Cleanup: Check.
Factory Reset: Check.
Soloing: Check.
As I mentioned earlier, it appears that a rollback will be required. But what really baffles me about this is that I'm the only one who seems to be having these problems with the latest build :-(