Lock your X-Windows in 3 easy steps! (aka I'm having peculiar problems)

[Phill MV]

Howdy folks!
Just about my first problem with Ubuntu, have really enjoyed using it the
past 4 months, etc etc, it looks really pretty.

I upgraded from dapper last night, using the ever popular gksudo
"update-manager -c".
It downloaded stuff, thrashed awhile, stopped twice for user input (are you
sure you want to use non-free flash?) and rebooted.

X threw up in my lap and declared that it no longer had the nv driver. I vim
it back to "nvidia" in the good ol' xorg.conf and go on my merry way.

I then logged in, and discovered that I can now freeze X in three easy
steps.
1. Open firefox.
2. Open a new tab of some sort from a click of some sort.
3. Bathe in it's frustrating beauty.

X is now completely locked up. I can't switch to a terminal (ctrl alt f1-6)
or restart X (ctrl alt backspace).
Sometimes the mouse is still responsive, but then it can't leave whatever
screen it's currently in (I use xinerama on two nvidia card powered
screens). Clicking on things is futile.

I can still ssh in from a windows machine I have lying around, so everything
works.
Killing firefox doesn't do much. As far as I can see, only restarting X gets
me anywhere.

Opening synaptic achieves the same result, although everything else seems to
work just peachy keen (OO.o, azureus, amarok, gThumb, etc).

Any thoughts would be appreciated!
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