I'm having a series of issues with mohaa. Either it wont load a map because "mohaa requires a video card with multi-texturing capabilities" or it loads the map but the video/sound settings are all screwed up. it's made it a hassle to load mohaa.
You have a bad card or something? I have the worst vid card and mine runs it fine.
Set your setting in video and audio then exit the game and go the the configs folder and set your unnamedsoldier.cfg to read-only. This should handle that problem. Try that and tell me what happens.