Err.. I get this happening too. I can't see how this removes the message. I'm new to Perl, but the line
if ($main_line =~ /Nothing to show yet./) { print MAIN ""; }
has no "else" and so the default
print MAIN "$main_line";
causes it to be reinserted anyway.
I've archived and added new entries and it appears everywhere still.
Does this work for everyone else?
Fab script by the way - ;-)

Indeed, adding an "else" fixes the issue on my version.