Tango, - I'm not certain that I follow what your setup is, but from trying out a few tests, it might be worth setting both the MA3 resolutions to be the same as each other, (ie, in the 'MA3 Display Settings'), irrespective of what your hardware settings might have to be, (ie, in your 'Windows Display Properties Setting').
I find that I can change my monitor's resolutions so that they are different to each other. But keeping the MA3 resolutions the same, corrects the problems that the first change caused. .... If that makes any sense!!!
Bottom line, - try setting Screen 2 (in MA3's 'Display Settings'), to 1600x1200, - if that is available!
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