I really did it this time...

KDenLive (video editor) couldn't handle video with any effects. Assuming that the driver selection was causing this, I selected the second or third video driver option in KDenLive's video driver list. Now, when I start the application, my entire screen goes black and doesn't come back.

Here's a screenshot, if it helps:



(That part was my idea of a joke... ya know, humor? Anyway...)

My only escape is to ctrl+Backspace to get out and log back in. Once I log off, I can see my screen again. When I log back in I can see everything again, but if I open up KDenLive again, I lose everything and the process starts over.

I guess at this point, I just want to be able to put KDenLive's default settings back without going back into the program. By the way, I uninstalled it and reinstalled it and it seems to remember my screw up, so that didn't fix it.

Help is on the way, I can feel it...

Just in case anyone looks, here the answer, now that I figured it out.

Turn off restricted drivers, reboot, open KDenLive and you can see it!

Phew!