I've fixed the issues on desktop now, according to someone else who had the problem. Thanks for reporting them.
This is a soft-launch, with basic functionality. We'll be polishing it up tonight and announcing it properly soon. :)
It still does not work for me on Browser not chrome or firefox i cleared the cache also. the only thing that's changed is that there's a random order button & a relegation zone type red box on the bottom 4 on the left but i still cannot move any of those tracks from the left to the right or vice versa, nor sort the order, same as yesterday.
It does work on app though just not browser on pc.