I recently tried upgrading to 100.14.11 from NVIDIA-FreeBSD-x86-1.0-9755, however now when X starts it crashes just after the nvidia splash screen.
The following link has the nvidia bug report log, the Xorg coredump, and a backtrace of the crash with gdb.
Note: I've confirmed this crash with the following driver versions:
NVIDIA-FreeBSD-x86-1.0-9639 also crashes, however in a different way.
You can find an error report here:
Confirmed working driver versions:
If you need any other information please let me know.