Hi Matthew,
XP sp3 3gb machine, Avid MC 3.5.4, Sorenson 4.3, RED 4.3.3, just upgraded from 4.3.1. Found .ini files for 4.2 and 4.3… deleted both, same behavior. Yes, behavior started after upgrade to QT 7.6, then downgrade to 7.1.6. Repeated re-installations have not helped. I select Quicktime Movie from the Export drop-down menu. Compression settings default to Animation. Clicking on the Compression Settings button causes RED to crash.
best,
Scott