It worked for me also (Perl v5.16.2). It would be helpful if you could post some of the surrounding code.
Lexical variables are preferred to bareword filehandles.
open my $fh5, ">>", "tagfile1" or die "Error: $!\n";
You may want to take a look at perldebtut and use the debugger to make sure your code is actually reaching the open / print statements as suggested by quester.
And as always,
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