Thunderbird crashes since Xorg 6.8.1

[Mark Daniel Reidel]

Dear list,

ever since I switched to Xorg 6.8.1, thunderbird crashes when successfully
fetching mail in the background. I see that new mail has arrived and *bang*
SIGSEGV :o(
Has anyone else had this problem? The only information thunderbird -g gives
me is at the end of the mail. I also rebuilded all my ports using
portupgrade -fa, but to no success. Any ideas?

     - Mark

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1 (LWP 100147)]
0x29774a94 in nsTransferDBFolderInfo::nsTransferDBFolderInfo ()
    from 
/usr/X11R6/lib/thunderbird/lib/thunderbird-1.0/components/libmail.so
(gdb) bt
#0  0x29774a94 in nsTransferDBFolderInfo::nsTransferDBFolderInfo ()
    from 
/usr/X11R6/lib/thunderbird/lib/thunderbird-1.0/components/libmail.so
#1  0x297aec5d in nsImapMailFolder::GetBodysToDownload ()
    from 
/usr/X11R6/lib/thunderbird/lib/thunderbird-1.0/components/libmail.so
#2  0xbfbfcfd4 in ?? ()
#3  0x298d5c70 in nsIMsgAccount::GetIID()::iid ()
    from 
/usr/X11R6/lib/thunderbird/lib/thunderbird-1.0/components/libmail.so
#4  0x00000000 in ?? ()
#5  0x289388b0 in ?? ()
    from /usr/X11R6/lib/thunderbird/lib/thunderbird-1.0/libnspr4.so
#6  0x28939c44 in ?? ()
    from /usr/X11R6/lib/thunderbird/lib/thunderbird-1.0/libnspr4.so
#7  0x00000002 in ?? ()
#8  0xbfbfcf30 in ?? ()
#9  0x28a41909 in pthread_mutex_unlock () from /usr/lib/libpthread.so.1
Previous frame inner to this frame (corrupt stack?)