The reason for these black screenshots is due to the 'Windows Aero' feature that is present in both Windows Vista and Windows 7. Currently UAC2 conflicts with this and that is the result of these black screenshots, this is an issue that UAC are currently working on however for the time being we need to use the fix below. This process is identical for Windows 7 and Vista users.
Step 1:
First of all, try to set in your game's option Anti-aliasing OFF and then try to make valid(not black, etc) screens with UAC2 again. If it helped, you don't have read the full page. If your screens are still black try the other offers below.
Step 2:
Navigate to the directory your Modern Warfare 2 is installed to, this may differ based on where you installed your Steam client to, the following is where Steam is installed by default:
C:/Program Files/Steam/steamapps/common/call of duty modern warfare 2/ --- (32-Bit)
C:/Program Files (x86)/Steam/steamapps/common/call of duty modern warfare 2/ ---- (64-Bit)
Step 3:
Locate your 'iw4mp.exe' file, this is the Modern Warfare 2: Multiplayer executable, you need to right-click this file and go to 'Properties'
Step 4:
Navigate to the 'Compatability' tab, once there place a tick next to the following boxes:
Disable visual themes
Disable desktop composition
Run this program as an administrator
Step 5:
Navigate to the directory your UAC2 is installed to, this may differ based on where you chose to install it during setup, the following is where UAC2 is installed by default:
C:/Program Files/DExUS/UAC2 --- (32-Bit)
C:/Program Files (x86)/DExUS/UAC2 ---- (64-Bit)
Step 6:
Locate your 'UAC.exe' file, this is the UAC2 executable, you need to right-click this file and go to 'Properties'
Step 7:
Navigate to the 'Compatability' tab, once there place a tick next to the following boxes:
Disable visual themes
Disable desktop composition
Run this program as an administrator
Step 8:
Press 'Ok' and close any remaining windows you have open. This will disable your 'Windows Aero' theme when you open Modern Warefare 2 and re-enable it when you quit, it will also fix the issue which results in black screenshots.[b][i]