Let me join in with you by stroking my chin too.
Yesterday, tapping some keys in Pages did bring up text in a fresh document. Today I tested Keynote: unable to do text entry, like in Numbers. Pages is now the same way. Even though all of the toolbar and various button functions are accessible, along with menus. It's just the Quicktimes that refuse to respond to even mouse input.
In my main admin account, Quicktime X opens fine, though the movie that's currently 'stuck' in both QTs in my main account wouldn't open in the admin account. Keynote worked fine.
Fortunately, I still have Numbers accessible on 10.5 too.
Lion's downloading now. I suppose I'll venture into reinstalling it sometime...