Avast are stony silent.
This false positive is being solved for sure. Why do you think they're not working?
I thought they were not working because they had not responded to a support ticket.
I had originally sought help through the technical support centre on the Avast web site, which seemed to be the obvious place to look. I had searched and there was no mention of admuncher on it.
Having submitted the ticket, I can supposedly review its progress. It remains as status "received". A note above the ticket list tells me "Listed below are the Tickets submitted by you. You can click on a Ticket subject to view the Ticket history." BUT THERE IS NO SUBJECT SHOWN, so I cannot do what it suggests.
It was only later that i found the user forum, and from there it seems obvious that Avast are working.
I'm not sure why the support centre exists, if the support is actually given through the avast!webforum. It sure confused me and made me consider moving from avast to a different anti virus.