Wondering, once I choose (from the menu bar) the nVidia Web Driver, should it still be set to that after a reboot? I have a GTX 960 (non-flashed) that works on boot-up (Yosemite), but always defaults to "OS X Default Display Driver". I choose "nVidia Web Driver" and it selects it (although nothing really seems to change). I can look at the drop down and nVidia is still chosen, but after reboot, it's back to OS X Default Display driver. One other thing, just got two Dell P2715Q 4K displays. Connected via Displayport to the GTX 960. In Yosemite, my maximum scaled choice is 3200x1800. Shouldn't there be a 3840x2160 choice? Thanks.