Removing nvidia-glx-new and installing original drivers (with NVIDIA installer) things go OK (until next reboot..), so I guess the problem is "only" with Ubuntu packaging of nvidia new drivers...
Installing original drivers is not a work-around because after rebooting "desktop effect" will be disabled as ubuntu desktop WANTS nvidia-glx-new installed.
Trying to re-enable them triggers the installation of nvidia-glx-new
Same problem here. NV QUADRO + nvidia-glx-new.
Removing nvidia-glx-new and installing original drivers (with NVIDIA installer) things go OK (until next reboot..), so I guess the problem is "only" with Ubuntu packaging of nvidia new drivers...
Installing original drivers is not a work-around because after rebooting "desktop effect" will be disabled as ubuntu desktop WANTS nvidia-glx-new installed.
Trying to re-enable them triggers the installation of nvidia-glx-new
... so I must stick with it!