Fixed! As i suspected, the problem was OpenMG 4.1 . The link though has pointed contains a different 3.2 installer wich is 100k bigger than the one i used after trying the standalone version. This one downloads OpenMG 4.2 . I just stopped the web installation after the downloads were completed and copied by hand the files stored in the temp folder. Then installed OpenMG 4.2, then Sonic Stage 3.2, and I'm done. It works perfectly, I can upload multiple times my recordings (NOT the ones already uploaded with Sonic Stage 3.0, those are deleted just as they were) and it's even faster, something like 2x, when the 3.0 was 1x. Great! Hope it works for you too.