Also new version of Wuala does not solve the problem. I took me another 15 minutes to test it.

The problem starts already when wuala is started, it takes minutes before the program runs. Afte deinstall of Avast the Wuala needs a few seconds to start. So it looks like more than only the firewall, there is really a conflict, and it all started after implementing Windows 8.1

I have a official ticket running with Avast for this, the asked me to install the new Avast today (…2008), but nothing has changed.