Sometimes when I open Photoshop CC 64 bit on windows 8.1 I get these warnings. I then have to restart my laptop for Photoshop to recognize my graphics card. Sometimes when I launch photoshop it is fine and there is no issue at all. It seems like every other time I launch Photoshop I get these warnings. I noticed that when installing programs from Adobe CC there are 2 versions installed. I tried opening the version that is not 64 bit and I did not get these warnings.
It means your video card or driver is marginal. The snifter program is de-selecting the card. Update driver from gpu makers website.
Thanks for the help! I updated my graphics card and so far there is no problem after shutting down and restarting a few times.
I noticed from another thread, that nVidia released a new Windows driver earlier this month. About the 3rd of March if memory serves. I don't know what card you are using, but I think some of those drivers cover a range of cards for the OS the driver is intended for.