You could always point and orient constraint a temp locator to your ice cubes that are currently geometry constrained. . . then bake those locators. . . then break your geometry contraints and point and orient constrain your ice cubes to the baked locators. . . then of course bake your ice cubes. make sense? obviously it'd be nice if the bake simulation would work on geometry constraints but this'll get you the same result. . I think.