Files difer from the server

Hi, since that rollback that Mw2 went through all the texture mods that I use now dont work as when i have them on (using thoses .iwi files) i get an error that files differ from the server, this happens when i try to connect or when i try to host, liberation still works fine, its just when i have texture hacks on that i get the error?
Does this mean i cant use them? As there are stilll realeses occuring i assume that texture mods still work for other people..