Thank you, it makes no effect and I sent you the zip.
Actually when I installed 13 I had troubles with zips not opening in Opus at all (even had a thread here - Opus not opening rar and 7z archives when they are opened from elsewhere - #2 by Leo )
So I borrowed from the forums - File Types > Zip > Commands > open > "C:\Program Files\GPSoftware\Directory Opus\dopusrt.exe" /cmd go "%1" newtab=findexisting
Maybe it's the issue.
Also when I have lister opened it opens normally as a tab. If all listers are closed then this issue happens.