During the last month, my iTunes library has become corrupted on 2 occasions but have managed to restore everything. However er previously synced albums on iPad are lost, so on my iPad I have around 5000 songs, but when I connect iPad to PC, the space used disappears and I have to re-select albums o sync. Playlists do not seem to be affected. Has anyone else come across this and is there a fix. It really is annoying having to try and remember the albums that I want on the iPad. Does not seem to happen on iPod!!