Hi. I updated to thunar 1.5.1. I connected to my server by gigolo (sftp) and i think when server shutdown, thunar crashed. Information: Xubuntu 12.10, Xfce 4.10 with thunar 1.5.1. If you need more info, just ask me for it. I like thunar. I attached apport crash file that created after thunar crashed. I can't extract stacktrace from it, i think that it will be useful for you.
Created attachment 4714 Apport crash file
A gdb backtrace would be nice, or errors from a console could give a hint.
Apport crash files are not very usable outside of Launchpad... Could you use apport-retrace (cf. http://www.piware.de/2011/08/apport-retrace-made-useful/) to get the usable stack trace? (only you can do it, it needs the exact same versions as used during the crash)
Closing.