I have synced my iPhone many times but this is a new problem. When I snyc it it backs up fine, then syncs the notes, then a dialog box comes up with the header "Adding files" and the message "Processing: 20100519 190557 4.m4a" comes up with a progress bar. The progress bar freezes up and iTunes freezes up. I can do nothing else on my computer except open the task manager to close iTunes, then the computer works fine.
Windows XP, iPhone OS 3.1.3