Yes...many people are experiencing this same problem..myself included. Ever since I installed the new itunes build (7.4) Not sure when it will get fixed...if you go to the apple support site, you will find numerous discussions on this topic....people are NOT happy.
That detailed help at apple is ONLY FOR MAC. I don't have a Mac so it doesn't help. I am really sick and tired of waiting for the new update. I want my iTunes store back so I can buy and listen to my music.