Last week after the patch I started experiencing a graphics bug where i would lose particles and quest path. I tried changing drivers. Purging and replacing drivers. Very frustrating. Then I noticed it happened only on 1 char. A char with a particular weapon that had just been upgraded to unparalleled. The Thayan GS u get from the underdark. Long story short, I replaced the cosmetic with a Sharandar GS and voila problem gone.
Aside from the fact that it only happened on GWF the second clue was that the thayan GS when not being used ran through the character model thigh. I guessed (shot in the dark really) that some combination of the new ench particles and the position it broke in the body model was root cause. This seems to indicate a level of fragility in the rendering system that was unanticipated.