Lately I've been experiencing this issue when uploading multiple tracks. I select a few mp3 tracks, say, and after what seems like an arbitrary number of tracks it just returns to the original screen where it's asking what I want to upload.
The playlist is never created, and no error message is ever shown. I'm wondering if one of these tracks is corrupt, but wouldnt I get an error message of some kind? I'll redo the conversion from .wav to mp3 just to be sure, but i was hoping someone in the community had some experience with this issue.