Whether or not it worked in 7.2 isn't extremely relevant. Granted, if it used to work, it should stay working, but RedHat has been known to do stranger things.
Try moving them, and see if the messages go away.
Edit: What does the command file /usr/X11R6/lib/modules/drivers/nvidia_drv.o print? What about ls -l /usr/X11R6/lib/modules/drivers/nv* -- are nv_drv.o and nvidia_drv.o the same size? If you rename (or move) the nv_drv.o file in that directory to something or somewhere else, then try the delete file and reinstall GLX again, does that help maybe?