[lexluthor]

Ok, well first of all, to clear things up, it does not look like it was your tcpmp stuff that's screwed things up.

I found a post over at XDA that said that the HTC YouTube App uses Windows Media Player and suggested I see what the video setting was there. It was set to NEVER use full screen.

I'm hopeful that's the fix.

BUT, now after installing and uninstalling various YouTube apps, I'm not getting the "Error Cannot play this video" message.

I've done a lot of searching and found a lot of people with this issue, but haven't found any definitive fix.

Any ideas?