I have been fighting MW and Collatz with the 5970's and finally got Collatz working by creating a cc_config.xml and using <ignore_ati_gpu>0</ignore_ati_gpu>

Which means the GPU is skipped and units 1, 2 and 3 compute. After a day or two of Collatz crunching I decided to try my hand at switching back to MW.

BOINC only requested MW CPU units for download no GPU (but I can see 0 is recognised but disabled in the startup messages).

So on some insipation I changed the cc_config.xml to be <ignore_ati_gpu>3</ignore_ati_gpu> and then MW downloaded the WUs and started crunching. So it looks as if GPU0 is disabled then MW does not look and use 1, 2 and 3 whereas on Collatz it does making it more ID10T proof :)

Can I suggest a low priority change the next time a code build is happening is to still crunch 1,2 and 3 even if 0 is disabled.