Well, when my graphics card draws the picture on the screen it doesn't take transparency into account - the result being grey boxes around faraway units. Search didn't turn up anything useful.
Here's an example - take note of the little AKs and Cans in the distance - they all have grey boxes around them.

Anyone had this before and got rid of it? Or knows what to do?
Anyway, I've just finished downloading a driver update, so I'll go see if that works. Probably not, though, but still.
Also does anyone know how to find out what graphics card driver you have?