My ATI is happy with CAW untill i hit that crappy "edit in game" button and I've found the best solution. I do not use "edit in game" mode anymore. I just export my world and build lots in game.
Since saving takes 50 million years in EiG, you are much better off doing just that: exporting, building in regular game, saving to library, and then plopping them all in one go in EiG.