After updating to iOS 6, iPhone will not charge from Mac Pro USB ports Immediately before I downloaded and updated to iOS 6, my phone charged in my computer's tower front USB port. Immediately following, it will not. I plugged it into my wall charger at home and it charges fine. Has anyone run into this and/or solved it yet?
This is a rather peculiar problem, and I have not found any more widespread reports of this problem.

Try rebooting everything; that often helps.