I have an iPad 3 (5.1) and iPhone 4 (5.0.1, jailbroken). Previously I had an iPad 2. As long as I can remember, I've had around 16GB of music, and all my devices were set to sync it all, and convert it to 128K. My iPhone (32GB) generally has around 2 or 3GB empty space. All of a sudden a few days ago the coloured bars in iTunes said I had 13GB of "Other" (yellow) and my iPhone 4 was now 11GB over capacity. I hit "Sync" anyway, now I have no yellow "Other" bar, but the blue "Audio" one says 4GB instead of 16GB+. When I look on the actual phone, all my podcasts and audiobooks are there, but I only have 2 music albums (should be over 100). I definitely have the box ticked to Sync All Music, and I don't use the "Only sync checked items" feature. I also don't use/have playlists. As I said, this just started suddenly for no apparent reason. If I untick "Sync Music" the blue bar goes away down, then as soon as I tick it again, it jumps back to 4GB. My iPad is unaffected, it sync all my music still.