So in researching this some more, I found these, which describes problems with
the X server receiving SIGQUIT with xorg 1.7.3 when the Enter key is pressed:
http://www.spinics.net/linux/lists/xorg/msg45959.html
https://bbs.archlinux.org/viewtopic.php?pid=803357
Not sure if this makes a difference, but X is starting on tty7 on this machine
and one of the others that has had the problem, whereas on my maverick machine
it starts on tty9.
$ sudo lsof -p 926|grep tty
Xorg926 root5u CHR4,7 0t0913 /dev/tty7
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