Same issue with teamviewer 12. Windows 10 64 Bit OS. 4 x Sapphire 570 RX's 2 x Sapphire 580 Nitros. You can plug in another screen to the GPU's and get multiple monitors if you have it enabled in your GPU settings in the BIOS. MSI Z270A sli plus bios. Not had this issue with other motherboards either.
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