Same here, had to go back to nvidia-glx-173.
With nvidia-glx-180 after logout X couldn't start again. After two or three 
minutes and few unsuccessful tries Ubuntu reverted back to "safe" driver but 
screen was distorted And split in two (I saw right side of the screen on the 
left side of monitor). There is a way of getting back GDM/X - you have to 
suspend laptop and then after it wakes up you have to blindly run gdm (blindly 
because you loose text mode - monitor is totally black, even without 
backlight). AFAIR logout works after that.
Also there is no problem with VT switching, User switching nor with 
suspend/resume. Just logging out.
I also have a Lenovo T61 with nvidia quadro nvs 140M but I don't recall having 
this problem before jaunty.
Oh, there is nothing in any logs indicating any problem. The only weird line 
I've found was this:
mtrr: base(0xd5000000) is not aligned on a size(0xe00000) boundary
in dmesg output.

-- 
[G86GL] Latest NVIDIA drivers: X hangs with blank screen after logout.
https://bugs.launchpad.net/bugs/258357
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