I have started a new discussion within the German forum.
http://forum.avast.com/index.php?topic=138426.0

At the moment a work around is

  • deactivate firewall before starting wuala (beware of outostart :wink: )
  • start wuala
  • activate firewall

both wuala and avast! IS are working

This can not be the “final” solution but it helps at the moment.

Dirk