When I go to app store on my iPod touch and select "purchased apps" at the top of the "update" screen, it looks like it is loading and then goes blank. This using iOS 6 and it used to work before iOS 7 came out. I have not upgraded (?) to 7 because I find similar complaints on internet about purchased apps not showing up with 7. Everything shows up fine on my iPad with 5.1.1. I have seen speculation that this is caused by a large number of apps but I only have <200 ever used. I also tried changing Apple ID. No help on Apple forums -- Apple seems to just ignore problems like this.