Nope, still doesn't work. Anyway, after doing some more checking, apparently the "moment" TDM changes my resolution is when I actually start a mission. It doesn't matter which mission (I've downloaded some more missions since my previous post), but after the mission level is loaded, I go into the Settings menu and lo and behold the res setting has magically changed back to 1366x768. Changing the setting back to 1280x720 will do nothing after I've exited, I'll check the doomconfig file and the 1366x768 setting will magically return there as well. Yeah, I did set to 16:9. 1366x768 is actually 16:9 as well, it's one setting above 1280x720. It's like TDM thinks I'm better off with one setting higher! I'm aware of D3 requiring a restart to change res.. that's the whole problem really. TDM keeps sneakily changing my res behind my back and because it doesn't do it instantaneously, it surprises me with a new res the next time I load TDM!