I have something to add to you´r "today i learned".
some years back i made a tool to automate the Thumbnail producing process. Yesterday i Updated and i think it could be useful for you:
http://bit.ly/TnGen073Tut

anther thing is that i don´t think that you´r editor was the Problem, I think it´s more likely that the Programmer of DTube messed up. This Side is more a Beta Version then a working platform.
I just waited and it worked again.