What did you use in the meantime then?
Testing 10.7, with 2DAccel on, apart from the black (or gray) window issue, so far I can tell Guild Wars through Wine exhibits the same behavior as with 10.6, text is often scrambled when entering a new area, displaying the map and going back to the game screen fixes that. The cause might be the same as for the window "fill" or "refresh" whatever it's called. On the bright side it's less severe than with 10.6