iTunes stuck on last stage of sync, "Waiting for items to copy", NEVER COMPLETES??

Ive upgraded all my software, OSX, iOS 5, new iTunes, etc. Now, whenever I try to sync my phone, either via WiFi or USB, I get stuck on the last stage that says, "Syncing Genius Data to Iphone (Step 7 of 7) - Waiting for items to copy". It won't complete the sync. Whats up???

Also, not all of my previous Ringtones will upload, so I cant use them. HELP!