So are we to assume every time there is a bug in KDE kwin we should blame it on nvidia?
I mean seriously do you realize how ridiculous that sounds
Have been using KDE for a lot of years now and have seen some pretty funky behavior with a variety of different video cards and drivers over the years.
Far fewer with nvidia drivers then lets say ummm Intel, ATI, VIA CHROME, Matrox..............
That said, I have the blur effect disabled on all my macines two with nvidia, one with Intel, and one with ATI.
Blur effect is a resource pig.