Hello:
My old and rarely accessed TC 8.1 installation went south so I decided to re-install using 10.1.
Yes, I had an image of the 1.0Gb SD card where it lived somewhere but ...
In any case, one of the first issues I have (there are a few more) is that after installing Thunar, it refused to start.
It installed correctly as far as I could see (deps seem OK) but it refused to start whether it is from the bar, menu or command line.
c@box:~$ thunar
thunar: error while loading shared libraries: libffi.so.5: cannot open shared object file: No such file or directory
tc@box:~$ 
So looked for and I installed libffi5.tcz and that was it.
Title:          libffi5.tcz
Description:    Foreign function interface
Version:        3.0.10
Author:         Anthony Green
Original-site:  http://sourceware.org/libffi/
Copying-policy: Free, see source code for details
Size:           12k
Extension_by:   bmarkus
Tags:           LIBRARY COMPATIBILITY
Comments:       Library is provided for compatibility reason to make
                older applications usable on current system with new version
                of libffi.
                ----
                It can coexist with other versions of libffi.
                ----
                Do not compile new apps against this old lib.   
                When creating tcz, user current libffi-dev.tcz
                from the repository.                                         
Change-log:  ----
Current:        2014/11/15 packed for TC 6.0
Unless I am mistaken, the currently available version of Thunar (from 2014) was compiled against libffi5.tcz, which would be the reason for the problem.  
Title:          Thunar.tcz
Description:    Modern file manage for Linux desktop
Version:        0.10.2
Author:         Jannis Pohlmann, Nick Schermer, Benedikt Meurer
Original-site:  http://www.xfce.org
Copying-policy: LGPL v2
Size:           524k
Extension_by:   bmarkus
Tags:           LIBRARY XFCE4
Comments:       Binaries only
                ----
                Compiled for RPI
Change-log:     ----
Current:        2014/04/11 First version, 1.6.3
Cheers,
MM
    [EDIT]: Added code tags.  Rich