>> I've got two users logged in, running X on different virtual consoles
>> on a 1.6[.1ish] box.  Normally works like a champ - Ctrl-Alt-F*
>> to switch from one to another.
>> 
>> However twice now, when switching, the target XFree86 gets itself into
>> a loop and kill -9 is the only option it seems.

>How, exactly, do you start X and what's the content of your /etc/wscons.conf?
>BTW, what graphics card and X server do you use?

First session - just "startx"
Second, login to vt02 and run (IIRC):

startx -- :2 vt02

wscons.conf is untouched from 1.6 distribution.

Card is  ATI Technologies 3D Rage Pro (AGP), 
X server is: 
XFree86 Version 4.2.0 / X Window System
(protocol Version 11, revision 0, vendor release 6600)
Release Date: 23 January 2002

As I mentioned, this all works fine for months at a time, but twice now
I've had to reboot the box to recover from this.

I'm now running xdm to see if that helps...

--sjg