Ok guys, I've had this problem since beta. Some days it's worse than others, but it is a daily occurrence.

Basically, every single graphics effect in the game will turn into a white block. It ranges from provoking effects to simple attack sparks after hitting the mob. This happens close up, far away, while there are weather effects, and when there are no weather effects.

Here are a few pictures of the provoke white blocks:

(Links are from Photobucket)

http://s1090.photobucket.com/albums/...hiteBlocks.jpg

http://s1090.photobucket.com/albums/...iteblocks2.jpg <-- shows the best white blocks

http://s1090.photobucket.com/albums/...iteblocks3.jpg

Here are my computer's specs:

(The glitch occurred with both video cards at any temperature.)
Video Cards:
Current: ATI 5850 (This card was also tested on a similar spec'd computer without any of the white blocks)
Old: Nvidia GTX 9800
Drivers: Up to date
Motherboard: Asus
Power Supply: 550watt
CPU: Quad Core 2.4
Ram: 4gigs
OS: Windows 7 64bit

Here are my game settings:

Windowed 1680x1050,
Multisampling 2xMSAA,
General Drawing Quality 8 (Standard),
Background Drawing Quality 4,
Shadow Detail Highest,
Texture Quality High,
Texture Filtering Highest.

Extra Graphics Info:

FPS: 30-60
Temp: Idle 39-50C, In-Game: 65-70C

If you need any additional information, please let me know and I will post it up.

~L.A.