Miner does not set optimal "-h" and "-a" options for many cards. It's because I don't have all cards here. Post first 20-30 log lines here so I can see how many compute units your card has and what's its name. Use "m" key to adjust "-h" value, or try to change "-h" values directly if OpenCL crashes.
This version requires some time to find optimal settings.
Everyone can post optimal "-h" and "-a" values for your cards here (and also card name as it is displayed and number of compute units), I will use this data to improve miner. Right now it knows only 290x,280x,270x and 6950 cards.