Thank you for the reply. The box is not checked, but it is grayed out. I cannot check it.
In PS, under preferences>performance>advanced settings, I have advanced drawing mode selected and all 4 boxes selected (Use gPU, Use openCL, anti-alias, 30 bit Display)
Dual video cards are known to cause problems in Photoshop. As long as the two cards are absolutely identical it should work - but you might try disabling one just to check.
(30 bit display is unrelated, and also moot in your case, since the GeForce cards don't support it).
That last box (30 bit display) is only needed if your monitors are actually 10 bit /channel as opposed to 8 bit.
The three screens part should be OK - I use three screens here without problem - however I do drive them from a single video card.
There is some information here about troubleshooting which refers to multiple cards and states Photoshop does not take advantage of multiple cards.
Given that you appear to have worked OK in previous versions, I would take this step by step. Which takes a little time but will hopefully help you.
Start by changing from Advanced to Normal. Hit OK then restart Photoshop.
If that does not work, change from Normal to Basic and restart Photoshop
If neither of those uncheck Use Graphics Processor, restart Photoshop, then check it again and restart Photoshop.
I know that sounds long winded - but hopefully it will get you closer to resolving your issue.
Thanks Dag - you posted whilst I was typing. Good point on disabling a card.
Sorry, please disregard my post if you got it.
I was thinking of something else.
thank you for the support. i have adjusted the advanced settings to normal and basic. unfortunately, it did not solve the issue. i have not yet tried to disable a card, but my two cards are identical,
looking for any further possible solution or items to check/test.