HUGE iTunes syncing problem

Ok, so I'm running IOS 5 beta 5 on my iPhoen 4 and iTunes 10.5 beta 5. MyiPhone has been running smoothly, but iTunes all of a sudden wants ro reset it up. I'm thing ok..., so i press set up as new, but I still have all my apps and stuff. And after i set it up as new again, iTunes won't sync my apps anymore! But it's ok, cause i have iCloud now. But when ever i try to disable WiFi sync or anything liek that, iTunes always prompts me to delete ALL my apps, which is something I don't want to do. Is there any fix?