Hello
I have been using crossover to play Guild wars on my mac for a while now and only recently the graphics have been acting up! taking armour on and off makes the graphics go bad. I have tried reinstalling with the crosstie and all but it still happens. It's a minor issue but its still annoying! here is a picture of what happens 
Stats:
2010 Mac OS X 10.6.8 2.66GHz Intel Core 2 Duo 4GB 1067 MHz DDR3 NVIDIA GeForce 320M
Cheers!
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The CodeWeavers Team
Caron Wills