The clients all start now, I can set them up, then they download the FAH 1.1 core and then they exit saying they encountered a grave error. This happens for GPUs 2-4 consistently. GPU 1 (aka 0) is crunching fine but only giving 2300ppd according to FAHmon.

All 4 cards are listed in the device manager, all have the current driver installed (well naturally) and I'm on Win XP so I don't need VGA dummies.

Sorry guys, that's it then, I don't have hours and days to try this, either it works or it doesn't. Clearly, it doesn't. Seriously they should make like a working installer for this stuff, as I did nothing wrong - double checked all the steps, it's a nogo