Currently Being ModeratedJun 21, 2013 7:35 AM (in response to William Damon)
Give this a try.
Disable iTM, open Music and let the content clear out, then do a hard rest on your iPhone by holding down the Power and Home buttons until the Apple logo shows up. Then renable iTM. Post back and let us know how it went.
Currently Being ModeratedJun 21, 2013 8:38 AM (in response to Michael Allbritton)
Thanks. I solved the problem by a different method.
First, I disabled iTunes Match.
Then, I went to Settings, General, Usage, then Music, and then Edit.
Tapped the Minus symbol next to All Music which brought up a Delete button for All Music.
I tapped the Delete Button and it deleted all music from the device.
I then went back in and reenabled iTunes Match. At that point everything synced as it should and the playlists all work normally.
Apparently the Music Files on the device must have gotten corrupted somehow. Deleting them all and then re-enabling iTunes Match solved the problem. Just disabling and reenabling iTunes Match, without deleting all the music files, didn't work.