Modular77: With respect the dialog on the iPhone 'XX items could not be synced. See iTunes for more information.' , would you happen to know where to look in iTunes? I looked in all the places that seemed logical to me.
I am, however, asking only for future reverence, as the initial sync which generated the error dialog was done via USB, and almost immediately after the USB sync, I ran a WiFi Sync—two in a row in fact—both initiated from the iPhone. Both WiFi syncs completed successfully with no error dialog.
I then ran another USB sync initiated from iTunes on the Macintosh, as was the first sync which gave the error. This second USB sync also completed successfully with no errors.
I think someone in this thread mentioned non-AppleStore products or DMR issues which I think could not have been an issue in my case, as I was running the sync to install updated Apps from the AppStore, and additionally had deleted some music and movie items to make sure there was room for the App updates. Nothing was added other than the recently downloaded App updates from the AppStore.
iPhone3GS iOS 5.1.1 build 9B206.
Developer Profile enabled. iCloud enabled.
32 GB “disk.” About 1.5 GB free after sync.
iPhone NOT jailbroken
MacBook 13-inch Aluminum, Late 2008 (NOT Macbook Pro)
Lion 10.4.7 build 11E53. 2 GB RAM.
Thanks for any info or advice. Problem IS now solved, but it absorbed a lot of time to reach that point.