Oof, sorry, I've got it sorted now - It was just deleting things like that converted Quake 4 map or other "in progress" maps I didn't want in the menu! =-3 As for the green tick, one other person pointed this out: In Sotha's Vertical Tower mission, I've completed it, even reloaded the game and completed it again - and no green tick appears after I get the mission complete screen. No other mission does this, which is weird.