Okay so iTunes Match was running perfectly across all my devices UNTIL iTunes 10.6/iOS 5.1. Now on iPad's/iPhone's its a mess. I have restored clean from backups where there is no music/itunes match turned off and tried to start clean and always ends the same. I will enable iTunes Match, open up the music app (with auto lock disabled) and it will sit at the cloud icon progress bar for like 3-4 hours and finally finish just to restart (this seems like an endless loop). Then i can see artists (some artwork, maybe 75% but the rest never downloads) but not playlists. Smart/Genius/Normal playlists never sync and there is no spinning circle action by the wifi/3g icon either. If I create a new playlist on an iOS device it will show up for a little while, and then disappear all by itself and not sync to any other library. I am out of luck and have no clue what to do next...driving me nuts and like I said happens on ALL iOS Devices. However my MacBook Pro which has no music on it just using iTunes Match syncs everything and playlists are perfect. my iTunes Library is 25,793 songs if that matters (967 are purchased so still under 25k limit, but just barely). I have turned off iTunes Match on my computer and turned it back on, no effect. Thoughts Anyone???