No, all tracks from older versions are compatible so this should already work.
Check if the track code was copied correctly!
seems to be correct. It's the first code from here, and I think I tried some other one before.
fails on the original sludge works from the very beginning, too. :/ at least on Firefox. (Although I don't think that should have any effect)
Actually, even new codes don't work if they're too large, although I can reload and overwrite large tracks. Perhaps my cache is full :/
There is limited storage space in browsers, so most likely you're out of space!
Try removing some tracks and see if that helps
will do :)