you could try changing the Video driver that X11 is using from nvidia back to nouveau or even to vesa.
# generated from default
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
VendorName "NVIDIA Corporation"
I personally stopped using Fedora for my Desktop Systems as it seems that every even build has problems with my nVidia Geforce 210 Video card and I have to switch to the vesa drivers for video to work. The easiest way to do this is, just prior to logging use "CNTL + ALT + F2" This should bring up a terminal login screen. Login as root and modify the driver line of
to either nouveau or vesa(I would recommend vesa) then use the following command
Then use the following to restart the Display Manager
This should reload the x-server with the vesa or nouveau drivers. You have probably found a bug that will most likely be picked up by many before too long.
You may even have to reboot for this change to take effect.