ATI TV Wonder Digital Cable Tuner Firmware Update Version 1.17.1
ATI quietly slipped an update for the OCUR tuners out today.
The ATI TV Wonder Digital Cable Tuner Firmware Update Version 1.17.1 has a group of fixes including: ‘Multiple OCUR could have the same IP address’ and ‘No TV Signal when tuning twice on the same channel.’
So it sounds worthwhile to update. Also the release notes mention that you should be on Vista SP1 so that you have all the latest hotfixes for VMC and CableCARDs in place.