Your logfile ends when the server tries to initialize DRI.
I have Xorg ver 1.7.6 (part of Ubuntu 10.04). My logfile contains the lines 

(WW) MGA(0): Direct rendering is not supported when Xinerama is enabled
(EE) MGA(0): [drm] DRIScreenInit failed.  Disabling DRI.

Maybe somebody realized that DRI doesn't work with dual heads and
disabled it.

To find out, try

       Option      "DRI" "off"

in the device section (and make shure it's really in effect by looking
at the log file)

-- 
Xinerama broken since intrepid on MGA
https://bugs.launchpad.net/bugs/292214
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