I'm staying with iTunes 10 because I like the interface. Until yesterday, no problem at all. But now, I can't buy any apps anymore in the iTunes Store section. The Store is still there, I can browse, search and preview songs. But when I try to buy a song or an app, I can click the "buy" button, but nothing happens afterwards. What I already tried: used different iTunes user accounts, for different countries. Also switched to a fresh user account, tried iTunes there, no luck. Using iTunes 10.7 on Mac OS 10.6.8. Anybody else having the same issue? Thanks.