Re: Strange issues with nvidia.ko
What do you see in /boot/modules (ls -l /boot/modules)? Is nvidia.ko there?
Do you have 'nvidia_load="YES"' or something else in /boot/loader.conf? loadnvidia.ko looks a bit odd to me.
Just in case run 'kldxref /boot/modules'. It will do no harm. It will just regenerate the kernel hints in /boot/modules so the nvidia module may be found.