Single file scan window stays open

Good morning to you all!

I have set the download statusbar add-on in Waterfox to automatically call cavscan.exe to check downloads. In my previous version of CIS (5.12) the scan window would open and, if all was well, disappear again almost immediately. After the recent update to CIS 7.0 the window remains open (most of the time, but not always) and has to be closed manually. When downloading several small files (such as photographs) this is very irritating.

I have tried setting the notification window timing to 20 secs instead of the default 120 secs but that did not help. The only effect was that a virus warning disappeared before I could choose a suitable response.

How do I instruct CIS to close the scan window if the scanned file is safe?