I'm running a 2010 Mac Pro with Dual displays (Dell U2412M) off of a NVIDIA GeForce GTX 770 2048MB Graphics card. I recently upgraded from OS X 10.8.5 to 10.11. The biggest issue I have is cursor movement. My main screen is on the right side and in order to move to the screen on the left, I have to move the cursor to the right. Changing screen order has no effect. While I was able to change the background on the right screen, the background on the left remains unchanged. I do, however, like the docks that are available on both screens now. Is anyone else having the cursor issue?