Aw shucks thanks Loadman!
Well, first off I was using the univert bezel, which worked well but still galaga and others would be off centre. Using mala as a front end as well. even just using mame a few would be off centre. Anyway to cut a long story short, in mala i turned of the switch resolution check box and all ok. I am not using the univert bezel anymore either.
philby