Steps to reproduce:
(* Ensure you save data in all open applications)
* Open Impress
* In the status bar, click on the far right of the zoom slider
* Enjoy crash.
I'm using Ubuntu x86-64, with an Intel graphics card.
Failed to reproduce on LibreOffice 3.4 340m1(Build:103) for OpenSuse Linux KDE. No crash when zooming to 3000%, which I think is the maximum?
Even if it crashes X under some circumstances that's not a fault of LibO then.