Thanks for the example. I ran it, and the DB was populated, but the code ended in the error:

Bizarre copy of ARRAY in list assignment at C:/Users/USERNAME/eclipse-
+workspace/.metadata/.plugins/org.epic.debug/perl5db.pl line 6548, <__
+ANONIO__> line 4.
END failed--call queue aborted, <__ANONIO__> line 4.
 at C:/Users/USERNAME/eclipse-workspace/PROJECT/mce_example_3.pl line 
+0, <__ANONIO__> line 4.
[download]

So I opened perl5db.pl, and line 6548 reads:

...
sub _dump_trace_calc_saved_single_arg
{
    my ($nothard, $arg) = @_; # <-- LINE 6548

    my $type;
    if ( not defined $arg ) {    # undefined parameter
        return "undef";
    }
...
[download]

Any ideas?