I installed display fusion only as a test (I am a Linux and Windows engineer). But whet I removed it, the same day. And rebooted my system 2 of my three displays were not detected anymore! On our pc's, we have msi radeon rx 570 cards installed. with 3 display ports. And it normally works without problem on all of the pc's, never one problem occurred.

Now I have been busy with this issue on sunday 3 hours now! And still it is not solved. I updated the driver, removed the driver switched cables tested all 3 monitors, they work, and the I decided to switch the graphic card with another one (geforce GT 710), guess what same problem still. After installing the correct driver the problem is solved for the geforce card, now I will place the radeon card back an check if that also works.

You an understand that I am not to happy with this situation, I have been spending half of my sunday on it......

Will post later if I can get the old card to work again....