Thanks for all the replies and response. By the amount of posts on V7 I'm sure Avast will sort this out as soon as possible..
For the record: Disabling the Sandbox did not work! It still reports, alerts and crashes - every single time. Even disabling ALL realtime shiels, sandbox, adding exclusion paths and executables did not seem to make a single difference - hence the huge amount of time spend (wasted) on this subject.
And that explains my (I'll admit: a perhaps somewhat) aggressive choice of topic title: spending 5 hours + on getting a virus 'killer' to work - is more time than it costs me to fully re-install a workstation after it has been trashed by a virus
Anyway, I hope Avast learned a lesson on this one - as a developer, I know we all make mistakes. But Avast should realize (all the way to the top!) that you can only break the trust with a user ONCE...
Good luck to all of us...
Danny.