I'm calling it weird because I've tried everything on google but nothing worked.
I was using cc3d in its vanilla form, and it worked all fine and dandy, until one day when the USB port suddenly stopped working. After that no matter what I did, the usb port just wouldn't play nice. I used the main port uart and flashed clean flight, then I flashed tau labs fw, then back to openpilot, but the usb didn't work at all. Anyone experienced with arm uCs, can you give any suggestions? I don't have a jtagger, but I'll try with a bus pirate. Do you guys think its a software problem or hardware? The hardware doesn't have burn marks anywhere.

Uninstall openpilot software and install again then try.