I don't see a way to refile this post under a different project, but it
probably belongs under xserver-xorg and possibly under xserver-xorg-
input-wacom.

I've resolved my personal issue to my own satisfaction, although I'm not
sure that xorg should segfault on this particular issue. The key to the
puzzle came with a more extensive problem description in apport, which I
tried to submit but didn't succeed. In any case, part of the apport
response discussed that it was trying to remove the Wacom device. That
convinced me that Qt, which I was previously staring very hard at, was
not the problem and that I should check on the Wacom settings in my
xorg.conf file.

When those were removed, two things happened: (1) GTK programs did
indeed start again; (2) my tablet input device still worked, as if by
magic. (It didn't before I put those lines there!)

So, to place the bug more narrowly: there were some recent patches in
xserver-xorg-input-wacom. I believe that one of these patches
automatically configures the tablet device for you -- a process that
previously had to be done manually in xorg.conf. If the xorg.conf file
specifies a manual configuration, apparently everything goes smooth for
most applications, but GTK for some reason tries to remove the device
and/or create a new one -- the details aren't clear to me. When the
device gets removed and then recreated, Xorg apparently gets confused
and segfaults.

I have the feeling that not all of that is right, but in any case:
something weird is happening that probably shouldn't be happening, even
though the userbase it affects is probably a fringe case.

-- 
Wacom + GTK + old configuration causes Xorg to segfault with error 4 under 
Kubuntu Jaunty
https://bugs.launchpad.net/bugs/359133
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