I'm afraid that, indeed, it's coming from a hardware piece on your PC.
I've no report of that kind from other users, I myself test mGalaxy on many different systems...and you can see that it works on another "similar" PC (as you reported).
It could come from your graphic card, check that you've the latest driver installed...and if it's possible you could even try to momentary switch the graphic cards between your 2 PC and see what it gives!?