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: Of course, and I know also, what this "something" is :
: http://tetrabb.com/forum/WebBBS/index.cgi?md=read;id=10427

Nope. It shouldn't run into that IF clause for removing new flags.
But you could test and see what happens if you change:

if ( ($ENV{'QUERY_STRING'} =~ /$QueryMode{'post'}/)
     || ($ENV{'REQUEST_URI'} =~ /$QueryMode{'post'}/)
    ) {
    my $teststring = $tbb->{'post'}->{'body'};

to

if ( ( ($ENV{'QUERY_STRING'} =~ /$QueryMode{'post'}/)
        || ($ENV{'REQUEST_URI'} =~ /$QueryMode{'post'}/)
        )
       && ($tbb->{'post'}->{'body'})
    ) {
    my $teststring = $tbb->{'post'}->{'body'};

Pay attention to the red opening bracket!

However, I don't expect this to work better .... but who knows

Rainer