I had the same issue yesterday after the patch, most noticeably just outside the entrance to The Rising Stones @ Revenant's Toll in Mor Dhona. The entire UI would flicker - chat boxes and log text would blink erratically, while the icon bars & map and other graphical elements would get distorted. This happened when I changed the camera position/angle or moved my character - it didn't occur when I was still.

My GPU is a NVidia GTX 460, OS is Windows 7 Ultimate.