I have had the same thing happen screwing with this phone. I have gone back to stock about 4 times and tried a bunch of different ROMs / Kernels / Themes etc...
What I have found is that the USB Serial Bus controller gets confused. Sometimes I have seen a yellow Bang! on it and sometimes not. Remove your USB Serial Bus controllers for "USB Mass Storage Device".
- Unplug your phone
- Right click on My Computer
- Click on Device Manager
- Expand your USB Serial Bus Controller (will be expanded if there are any bangs on it)
- Right click and remove each "USB Mass Storage Device"
- Plug your phone back in (use a USB port that is directly on your Motherboard)
- Computer should recognize it and automatically reinstall the driver you already have on your computer from previous installation. (if not use the one DroidXcon posted above)
You 'should' be back in business