now I get the same crappy behavior like you described on my laptop with ubuntu 9.04
latest updates from today: 180.41 -> 180.44 made the difference:
default gtk-apps (still) seem to work but I get "Segmentation fault" at least for nvidia-settings, glxinfo, glxgears ...
I haven't restarted yet so after the restart it might not work anymore !
the system is:
Dell XPS M1330, amd64 version of Jaunty / Ubuntu 9.04
graphics chipset is: 8400 M GS
now it's obvious
that all of those problems are caused deep down at the heart of that blackbox - your driver
need an update NOW
(or at least a status
this is happening and that you got a fix for it in the pipeline)
now THAT's strange: after a reboot everything seems to work fine again
so it was just a temporary problem due to mismatching libraries I guess ?
I still need an update / fix for my 7600GT if it's NOT clear that an upgrade to a 9600GT would fix it - there's no way I'm gonna buy it so fast ...