You said it's maxium zoom out. You mean you used the wheel for zooming out, or is it the default setting? (the one you got by clicking on the wheel) If it is the former than it is normal, it's called scaling artifact. If you have dots on default (1:1) than it is a bug.
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Im on Win 7 64bit, AMD Phenom II 965, ATI 5850 with latest drivers
still, I am grateful for the ability to zoom, what a great addition to the game