[Bug 1051231] [NEW] Picard freezes X when overlay scrollbars are enabled

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after starting a wireframe shows up, and then a high I/O-load occurs, memory is consumed up to 90%, X-Windows gets completely unusable (freezes), but changing to console (ctrl-alt-f1) is possible - 20-40s after pressing the keys - and instantly I/O-load drops to zero as switching to console happens.
Therefore I think this may be a problem with QT or even X-Windows itself.
There are some errors printed by picard/QT/X-Windows on the running terminal:
(python:5103): Gtk-CRITICAL **: IA__gtk_widget_style_get: assertion `GTK_IS_WIDGET (widget)' failed
{Comment: dozens of that}
QWidget::setMinimumSize: (/MainWindow) The largest allowed size is (16777215,16777215)
{Comment: some of that}
QNativeImage: Unable to attach to shared memory segment. 
X Error: BadDrawable (invalid Pixmap or Window parameter) 9
  Major opcode: 62 (X_CopyArea)
  Resource id:  0x0
X Error: BadDrawable (invalid Pixmap or Window parameter) 9
  Major opcode: 62 (X_CopyArea)
  Resource id:  0x0
{Comment: these are the last lines of the log - after that everything freezes}

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: picard 1.0-1
ProcVersionSignature: Ubuntu 3.5.0-14.18-generic 3.5.3
Uname: Linux 3.5.0-14-generic i686
ApportVersion: 2.5.1-0ubuntu7
Architecture: i386
Date: Sat Sep 15 13:11:43 2012
ExecutablePath: /usr/lib/picard/run
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120724.2)
InterpreterPath: /usr/bin/python2.7
ProcEnviron:
 TERM=xterm
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
SourcePackage: picard
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: overlay-scrollbar
     Importance: Undecided
         Status: Confirmed

** Affects: overlay-scrollbar (Ubuntu)
     Importance: High
         Status: Confirmed

** Affects: python-qt4 (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-bug i386 quantal
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Picard freezes X when overlay scrollbars are enabled
https://bugs.launchpad.net/bugs/1051231
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