Please help - iTunes 11 screwed up my music collection
I upgraded to iTunes 11 but have 2 problems. Previously my iTunes Media folder and hence iTunes showed each artist and all their albums nested under them. All compilations showed under Compilations. I now have artists listed correctly but the compilation albums have been scattered across the folder. So instead of every artist on a compilation album showing listed under that album under Compilations they are listed individually in the list of artists even if they have only one song. It looks a real mess and I haven't dared to try to sync it yet.
While trying to sort this out I noticed that a few of my albums are also in a mess, so that where I had an artist with 3 separate albums, one might be listed separately and the other 2 with all the songs jumbled under one album title and the other disappeared. Some albums have gone altogether and I'll have to re-rip them. I know this happened a while ago as all my backups are similarly corrupted. I have painstakingly gone through 2 artists rebuilding the albums but when I open iTunes it shows the same old mess of jumbled albums. I have tried rebooting, checking that the path in iTunes points to the C Drive folder which I have tidied up but it makes no difference. I have also tried File>Add folder to library to see if it would refresh.
I would be very grateful for any help with either or both of these problems as I am sick to the back teeth of staggering from one problem to the other in iTunes.
Incidentally, I am not sure whether this is posted in the correct place and wondered if we could have an iTunes sub-forum.