So far we were unable to reproduce the issue.
When the application starts it execs some scripts which check the avast! is installed properly and (if not) they perform some update/install/repair actions. During the beta stage, these script output their activity into /tmp/script.log-$PID (where $PID is process ID of the exec'ed process)
It would be very helpful if you can send us these outputs. It should be sufficient if you send two most recent of them. (Note that during reboot, /tmp is cleaned out, so you may need to reproduce the problem with quitting the app, to create the files).
Thanks
Mity