[Tim Kolb] “You might also try starting while holding down the SHIFT key (is that the one? Somebody correct me if I’m wrong please) to reset the prefs file.”
For PremierePro thats correct, it recreates the Plug-in Cache file(preferences), when Adobe products get wonky this is one of the first thing to try, there are different key strokes for Photoshop Illustrator, etc.