I have the same problem and it too started around the same time: I've tried clean install, flushing caches manually, other regions, toggled VBO ... all normal fixes and ideas i could get. Still the upload window either crashes or values stay to zero and upload doesnt do anything. I know two more people who have the same problem.
Using qavimator and phoenix - in sl viewer the option to upload is greyed out!
ANY ideas welcome to solve this, lol.