You're right the problem comes from mathlab, see http://people.debian.org/~terpstra/message/20061127.041128.8a08d75f.en.html
Since mathlab is not in ubuntu, I will reject this bug. Please report it
upstream, thanks
** Changed in: libx11 (Ubuntu)
Status: Unconfirmed => Rejected
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[feisty/x86] new libX11 with XCB crashes Matlab
https://launchpad.net/bugs/87791
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