I'm having the same issue using this server layoyut, which worked in 9.10:
Screen "Bottom Screen"
Screen "Middle Screen" Above "Bottom Screen"
Screen "Left Screen" LeftOf "Left Screen"
Screen "Right Screen" RightOf "Right Screen"
Unfortunatly I can't work around it as I need "Bottom Screen" to be
screen 0. Everything thing is fine if I assign the screens from left to
right, top to bottom.
The bug was reported to xorg, and there are two patches. They stop the
crash but my pointer is confined to screen 0 when using them.
https://bugs.freedesktop.org/show_bug.cgi?id=24986
** Bug watch added: freedesktop.org Bugzilla #24986
http://bugs.freedesktop.org/show_bug.cgi?id=24986
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Multi-Screen Layout (3) - Moving Mouse to Left Screen Causes Segmentation Fault
https://bugs.launchpad.net/bugs/551202
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