Well, this has obviously nothing to do with services interacting with desktop, as there are no services affected here (ashsimpl.exe is an ordinary program).
Anyway, could you please create a dump of the "invisible" ashSimpl.exe process, as described e.g.
here, and upload it to our FTP? (preferably after compressing it into an archive).
It is necessary to disable avast! self-defense first (avast! Settings / Troubleshooting page), otherwise the dumping will not work. Thanks.