When accelerated compositing is disabled, QuickTime plugin doesn't load because it tries to set NPDrawingModelQuickDraw instead of using CA/CG models.
Created attachment 189645 [details] Patch
Comment on attachment 189645 [details] Patch Clearing flags on attachment: 189645 Committed r143675: <http://trac.webkit.org/changeset/143675>
All reviewed patches have been landed. Closing bug.