Previously, I was having the same issue as others on ticket #6002 where I was getting the same error when trying to upload a hero.  It would crash and say, 

"The software was closed because an error occurred"

However, after taking others advice, and waiting on the main screw for a couple minutes then trying, I can get to the upload screen without crashing, but now it just gets stuck in uploading.  The little red cube on the bottom right keeps spinning and doesn't seem to be doing anything.  I waited for 15 minutes and it never changed.  I don't know what to do anymore.