I just wanted to add a "me, too." We've now seen this on three different
machines (two different hardware setups). It seems to occur during
graphically-intensive operations. In our case, it has occured both
during Matlab figure generation and Tecplot drawing. One machine has an
Intel 945G, and the other two have an nVidia NV18, so it doesn't appear
to be related to the graphics card or drivers. I've enabled core dumps
on my machines, so when and if it happens again, I may be able to upload
a core file. In the meantime, I'll attach a couple of the X backtraces,
just for some more examples.

** Attachment added: "X Segfault on nVidia/Matlab"
   http://librarian.launchpad.net/6438382/x-segfault-nvidia-matlab

-- 
X appears to crash randomly
https://launchpad.net/bugs/71913

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