fourzerotwo said it was the effect of fixing some kind of hacks or something and it should fix itself in a few hours. here are the posts, its from playstations blog.
Robert Bowling | July 12th, 2010 at 11:51 am
We’re looking into it now and will address quickly. Possible side affect of some anti-hack backend changes we were doing.
Robert Bowling | July 12th, 2010 at 12:05 pm
Glad you like the maps! No need for a patch for flashbangs, it should be gone in a few hours and back to normal.