I'm having the same problems.
I can't vote on a video I can comment on a video and now out of the blue the one video that I managed to upload after about 10 trys decided that the format isn't supported, it worked fine a couple weeks ago, other videos work just not mine.
I wanted to delete my DTube account because it's just a waste of time but I can't find a delete account option.
It's like that song by the Eagles "Hotel California" Check out any time you like but you can never leave.