When I click on "Enable USB storage" nothing happens. Is this a known issue? I'm on rev #63
First, you should update to the GB OTA and the current version of the ROM...
See the OP in this thread for the update steps:
The CM7 Gingerbread ROM (CM4D2-GB) is now ready for prime time!
USB connectivity works perfectly in the ROM currently - no need to double-plug anymore as well.