glxgears in current

I had tried to run glxgears in my FreeBSD 7-CURRENT, and got strange 
results : X-server rebooted, but my processes werent killed, even 
mplayer was  producing sound. After this I logged on to KDE once more, 
and tried again with same results. Mplayer & wget were working now in 
background. Can anybody help ?

/var/log/messages :

Mar  7 15:59:38 doer kernel: pid 82971 (Xorg), uid 0: exited on signal 6
Mar  7 15:59:38 doer kdm-bin[864]: X server for display :0 terminated 
unexpectedly

I'm using nvidia-driver-1.0.9746 binary drivers.