Is this a known issue in 5.12/5.11 (I forget which I noticed it on) -- but yeah, this sucks! Before everything looked absoluetly beautiful and had its reflection/shiny just right, same goes for Lost Coast, normal HL2, or DoDS- all is affected. I've double checked my HL2 settings and catalyst settings.
**EDIT: I'm using a brand new ATi Radeon X1800XT 512