too bad, with my radeon 6870 only getting

 [2013-06-12 04:17:25] Long-polling activated for http://yac.ltcoin.net:5555/LP
 [2013-06-12 04:17:25] Error: clSetKernelArg of all params failed.
 [2013-06-12 04:17:25] GPU 0 failure, disabling!


same with my nvidia