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Hope this is the right place to put a bug report, but this isn't something I've found reported already.
I'm using spotify premium, the desktop apps work fine on Windows, Linux, and Android, but if I try to use the webplayer the UI doesn't fully load, and I can't see or play any songs.
I tried to attach a log that I thought was relevant from the developer tools console, but this forum won't accept .txt or .log, so here's an image instead. http://i.imgur.com/kqfKtaq.png