Whenever I try to play Medal of Honor Heroes One I'm unable to get past the main menu. Say for instance I click on the campaign button, the game will freeze for a few seconds and not go to the next series of menus. I get the same result when trying to click on any other button, as well as when I tried using copies of this game from other sources. Has anyone else heard of problems from MOH Heroes One along these lines? Also I'm using 6.60 Pro temp edition, in case that helps. PS: MOH Heroes Two works perfectly.