An update on my earlier post. I spent some time trying to work out what was going on. I actually have 4000 albums in the cloud and 28k songs. So I sat down and made sure the xb music didn't fo to sleep while it was adding collection. It went through 12k+ songs and then stopped. No idea why it didn't do the whole 28k though. The 28k is the reading from my account at music.Xbox.com. My 920 was plugged in all the time and on wifi while doing this and the battery went from 100% to 28%, it took over an hour, and got blazing hot. Now albums and songs seem to work okay but artists is just blank. If I select "on phone" in artists it shows that correctly, but if I switch back to all music or streaming it doesn't change and just continues to show what's on the phone and says "loading" at the top while doing nothing. It's busted it seems. I cannot find a way to fix it, which should really be MSs job anyway....