Yeah, I think there is a problem for me, too, but it's not exactly what you described. I can't even upload the tracks anymore; for one song, it pauses at ten percent, and for any more than that, less than one percent. I let it sit for while, but after some time, it didn't budge. I hope this can be fixed in a timely fashion!

Sorry for inconvenience. The problem has been fixed. You can continue editing id3 tags of your mp3 files as usual now.