unity-2d-places crashed with SIGSEGV in QCoreApplication::notifyInternal()

Hello
just trying to browse files with orca screen reader running.
Thanks
Fabio

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity-2d-places 5.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-9.16-generic 3.2.1
Uname: Linux 3.2.0-9-generic x86_64
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
CasperVersion: 1.299
Date: Thu Jan 19 14:02:32 2012
ExecutablePath: /usr/bin/unity-2d-places
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120119)
ProcCmdline: /usr/bin/unity-2d-places
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
SegvAnalysis:
 Segfault happened at: 0x7ffe94a8940d <_ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent+125>: mov 0x40(%rax),%rbx
 PC (0x7ffe94a8940d) ok
 source "0x40(%rax)" (0x00000040) not located in a known VMA region (needed readable region)!
 destination "%rbx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity-2d
StacktraceTop:
 QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
 QAccessible::queryAccessibleInterface(QObject*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
 QAccessible::updateAccessibility(QObject*, int, QAccessible::Event) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
 ?? () from /usr/lib/x86_64-linux-gnu/libQtDeclarative.so.4
 QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
Title: unity-2d-places crashed with SIGSEGV in QCoreApplication::notifyInternal()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo