So tonight I synced my iPhone 4 with iTunes 10 and all went as expected. Next I wanted to move around some apps and create some new folders, but when I clicked on "Apps" in iTunes, I got the pinwheel and iTunes crashed. So I reopened and tried it again. And, yet again, it crashed. So I reinstalled iTunes 10 and tried....again. And it crashed when I clicked on "Apps".....again. Anybody else experiencing this?