soon after login: unity-2d-panel assert failure: *** glibc detected *** unity-2d-panel: invalid fastbin entry (free): 0x09b5b408 ***

[A H]

just after login managed to start synaptic and firefox

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity-2d-panel 4.6.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic-pae 3.0.4
Uname: Linux 3.0.0-10-generic-pae i686
ApportVersion: 1.22.1-0ubuntu2
Architecture: i386
AssertionMessage: *** glibc detected *** unity-2d-panel: invalid fastbin entry (free): 0x09b5b408 ***
CrashCounter: 1
Date: Tue Sep 13 09:16:47 2011
ExecutablePath: /usr/bin/unity-2d-panel
ProcCmdline: unity-2d-panel
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
Signal: 6
SourcePackage: unity-2d
StacktraceTop:
 __kernel_vsyscall ()
 raise () from /lib/i386-linux-gnu/libc.so.6
 abort () from /lib/i386-linux-gnu/libc.so.6
 ?? () from /lib/i386-linux-gnu/libc.so.6
 ?? () from /lib/i386-linux-gnu/libc.so.6
Title: unity-2d-panel assert failure: *** glibc detected *** unity-2d-panel: invalid fastbin entry (free): 0x09b5b408 ***
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 __libc_message (do_abort=2, fmt=0xb686a080 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:189
 malloc_printerr (action=<optimized out>, str=<optimized out>, ptr=0x9b5b408) at malloc.c:6283
 _int_free (av=0xb68a6400, p=0x9b5b400) at malloc.c:4795
 __GI___libc_free (mem=0x9b5b408) at malloc.c:3738
 qFree (ptr=0x9b5b408) at global/qmalloc.cpp:60