I had a problem after the update that the controlpanel wouldn't load :-( I had to run the following command:
chmod 640 /usr/local/ispconfig/interface/lib/config.inc.php
What I see in the error.log when I open the control panel:
page 1: illegal page type or format
PANIC: Invalid argument
PANIC: fatal region error detected; run recovery
I haven't found a sollution for the last part yet..