It's hard to reproduce "at will". I personally run Firefox, Thunderbird,
Chrome, gedit, gjiten, skype, pidgin, Gnome Terminal, and always have
something like 20 windows open at a time on my main workspace.

Of note :
- When alt tabbing between windows, sometimes surfaces flash to black for one 
instant before redraw happens.
This might indicate that the core problem with metacity crashing in the first 
place is linked to Xorg or the nvidia driver ?
- Also, with previous versions of Ubuntu, I did have metacity crash on me at 
times, but the session would keep on running, so I could relaunch metacity from 
an open terminal (or via console using : DISPLAY=:0.0 metacity ) ; The crash 
itself is not a problem, gnome-sessions's extremely poor handling of it is.

The easiest way for me to produce this crash is to edit text in gedit,
open a PDF in evince, and spend my time alt tabbing between them (which
happens quite a lot as I am doing translation work). At one point, I'll
start seeing redrawing artifacts (to explain : even though I switched
applications, the display still shows a black surface, or the
application which was on top of gedit at that time, and I have to
interact with the application for redraw to occur.

When I see this symptom, I know that within the next 50~100 window
switchings, I will crash.

The crash can even be triggered by clicking the window tab on the
application bar.

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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to metacity in Ubuntu.
https://bugs.launchpad.net/bugs/1507764

Title:
  metacity crashed with signal 5 in _XEventsQueued() ; forcing gnome
  session to logout

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