Holy shit, i've just found a fix:
So i just enable some settings in pldx particles tool, and download a mod called: Toon muzzleflashes by Chaofanatic. And somehow there aren't any x's anymore lol
(Here is the settings: http://imgur.com/a/CXq8A )
EDIT: Well somehow it's back, i think it only works when i record tga files when i first starting up the game, but the second time that i open the game and try to record again, the x's will return

Wait, have you ever experience this kind of problem?

Well wait a minute please, i'll provide you a screenshot as fast as i could, but i have to have dinner first lol

Hey everybody! So recently i've got the idea of making a montage video, so i've prepared everything. But there is just one problem: If i view my demos, every single muzzleflashes of almost every weapons( Except sniper rifles) seem to just show the muzzleflashes effect as a weird ass red 'x'. Every time i've tried to view the demos, they kept showing them. I've tried everything in the last few days: Verify cache, using pldx particles,... And it affects demos at all dxlevels (8.1,9,9.5,9.8) So please, help me. And does it affect you guys? Please provide me a solution, if you guys have any problem like mine, please let me know. Thank you.
(P.S: I'm using Lawena to record all of the demos)