My main screen is connected to one of output of one matroxSo you have 9 outputs connected to Matrox card. First you card is very slow (10 times slower than nVidia 1080 Ti), see benchmark https://www.videocardbenchmark.net/gpu. ... 16&id=3054
What is you main screen connected to ? Are you using movie hardware decoding ?
I have already setup the madmapper project with the 90 degree rotation screen. Windows see all the monitor in a normal position...and the issue still remain.We're not aware of such an issue. We'll do some testing.
In the mean time you can do a test: disable the 90 degree rotation in Windows and rotate the projector in MadMapper instead (if you rotate with shift key pressed you can easiely do a perfect 90 degree rotation). It will not change anything in your setup.
Does it solve the issue ?
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