I have tried everything. Almost 50 maps that I have fully installed and many directly off the UGX official Maps and still had them crash on me. The only 2 maps I have gotten to work were UGX Christmas and MW2 RUST.
For other maps it usually goes like this: I load the map from the mods icon in the WAW menu after downloading it and it works fine. I can look through setting and invite friends perfectly. But as soon as I attempt to play the map by any fashion (either singly player or co-op) It crashes.

Things I have done to fix this: 1. Made Sure I had the game running through steam. 2. Made sure the audio from the game wasn't crashing  it. 3. Made sure the dimensions on my game fit my monitor. 4. Made sure I had NO firewall on that could prevent the map working and that I didn't run it in safe mode.

And after all of those things the map still crashed on me every single time I tried.

If anyone knows anything I would much appreciate it. Thank you. There are many maps I would love to play like UGX Comosea and UGX Requiem. Thank you.

Make sure your game is updated.
Check your appdata mods folder (where dl maps are installed) for loose files not inside a maps folder.
Try with or without t4m.

Make sure your game is updated.
Check your appdata mods folder (where dl maps are installed) for loose files not inside a maps folder.
Try with or without t4m.

T4M? And I have the game through steam so i'm pretty sure the game is updated. Also I checked and no loose filed that aren't in a map folder in my mods folder. I even tried making sure there was only 1 map at a time. But thank you.

http://ugx-mods.com/forum/index.php/topic,8092.0.html

Maybe the maps your trying to play were made by a mapper using t4m.