clicking a directory in file dialog causes Scribus to crash

[Ubuntu version]: 12.04
[scribus version]: 1.4.0.dfsg+r17300-1ubuntu1
[lib1tgui4 version]: Installed: 4:4.8.1-0ubuntu4.2; Candidate: 4:4.8.1-0ubuntu4.3

I'm pretty sure this bug is actually qt-related rather than Scribus, but I'm not sure which component of qt is involved. I have have also had similar problems with QGIS.

The bug is that when I try to save or open a file using the file dialog, clicking on a folder will often cause the application to crash. In Scribus, it first gives me a "Scribus crashes due to signal #6" error dialog before crashing. A crash seems to only happen when I click on certain directories; I haven't done enough investigation yet to see whether it's always the same directories that cause a crash. A single click on one of the bad directories is all it takes (double-click not necessary). A screenshot of the offending dialog is attached, or view it at http://tinypic.com/r/111jbwi/6

After crashing I launched Scribus again, and this time it seemed to have lost some of its theming (I had to replace compiz and unity, though I don't know whether the two issues are related). The file dialog no longer caused a crash, but it looked terrible (http://tinypic.com/r/16lbpxz/6).

For completeness, here is the dialog that caused a crash in QGIS: http://tinypic.com/r/mmw51/6

I have not been able to find a bug which sounds similar, but it seems to be the same as what was reported in this stackexchange issue:
http://gis.stackexchange.com/questions/35002/qgis-and-ubuntu-browse-dialogue-causing-crashing

I am upgrading to the candidate qt4 package to see if that fixes anything.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: scribus 1.4.0.dfsg+r17300-1ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic-pae 3.2.30
Uname: Linux 3.2.0-32-generic-pae i686
NonfreeKernelModules: wl
ApportVersion: 2.0.1-0ubuntu13
Architecture: i386
Date: Fri Nov 23 14:42:52 2012
ExecutablePath: /usr/bin/scribus
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 LANGUAGE=en_ZA:en
 PATH=(custom, no user)
 LANG=en_ZA.UTF-8
 SHELL=/bin/bash
SourcePackage: scribus
UpgradeStatus: No upgrade log present (probably fresh install)