Would the default_mp.xex really be the problem when it works perfect before I add the patch?

Does anyone know of a good TuT that explains putting a patch on a Jtag?

Dude this happens to me alot.Have you tryed redownlodding the patch to the mw2 file if you have there is somthing the matter so you might have to take it back to your computer and change one thing (I know sounds stupid but worked for me) so change like a custom class name.That should work if not i will give you some other ideas.
-BBmodz 8)