I have updated my Debian unstable.
A few xfce4 pakets are changed from 4.1.90 to 4.1.91...
After this the xffm4 Filemanager hangs with a cpu load
of 100% and nothing happen.
It's the same on 2 maschines. 
I have made an strace dump.
xffm is searching in varies directories for ../icons/hicolor
and is searching for "hicolor.mime.xml" but doesnt found it and is running in a
endless loop.
 
greetings
Jörg