MW2 client call "iw4x" is incompatible with reshade, i know this because i tried the regular mw2 with resade and it worked fine. I Request That iw4x Could Be made Compatible with reshade regarding is basicllymw2 multiplayer basiclly the same thing.
So ReShade does not get loaded when you start the game? Did you choose the right API? Possibly it has Direct3D 11 instead of 9? If ReShade gets loaded at least shortly, it will create a log file with the name of its DLL, so for Direct3D 9 it would have d3d9.dll and a log file named "d3d9.log". For Direct3D 10/11 it would be dxgi.dll and dxgi.log, respectively.