I removed the usb port because I believed that I may have dripped some solder through one of the mounting points, but I've cleaned it up as best I could and can't find the short anywhere. I'm really scratching my head over this. Thank you for your reply.

I have a VERY similar problem! The same exact pad on my board is bridged to ground, but I can't see how. Can anyone assist? Possibly with a gpio bypass method or something similar?