Where do you see "Tool completed with exit code 255"????

When you use this tk-hlist_stresstest.pl, do you also the error? What line exactly triggers the error ( use Devel::Trace )?

#!/usr/bin/perl --
#!perl

use strict;
use warnings;
use Tk;
use Tk::HList;

my $mw = tkinit();

my $left = $mw->Frame( -bg => 'blue', -width => 210 )
  ->pack( -side => 'left', -fill => 'x', -expand => 1, );
put_hlist($left);

my $right = $mw->Frame( -bg => 'yellow' )
  ->pack( -side => 'left', -fill => 'both', -expand => 1, );
my $info = $right->Label()->pack( -fill => 'x' );

$mw->MainLoop();


sub put_hlist {
    my $parent = shift;

    my $hlist = $parent->Scrolled(
        'HList',
        -scrollbars => 'osoe',
        -selectmode => 'single',
        -columns    => 2,
        -header     => 1,
        -width      => 100,
        -height     => 30,
        -background => 'GhostWhite',
    )->pack( -fill => 'both', -expand => 1 );

    $hlist->header( 'create', 0, -text => '#id', );
    $hlist->header( 'create', 1, -text => 'Eintrag', );

    foreach my $cnt ( 0 .. 10000 ) {
        $hlist->add($cnt);
        $hlist->item( 'create', $cnt, 0, -text => $cnt );
        $hlist->item( 'create', $cnt, 1, -text => "Eintrag Nr. $cnt" )
+;
    }

    $hlist->configure(
        -command => [
            sub {
                my $hlist      = shift;
                my $info_label = shift;

                my $selected_item_no = $hlist->info('selection');
                return 0 unless defined $selected_item_no;

                # -- get selected text id
                my $text_id = $hlist->itemCget( $selected_item_no, 0, 
+'-text' );

                # -- display name in right frame
                $info->configure( -text => $text_id );

                return 1;
            },
            $hlist,
            $info
        ],
    );
}
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What happens when you use  use Win32API::File(); Win32API::File::SetErrorMode(2);

What happens if you end program with  POSIX::_exit(0);?

Start with a minimal program and info to reproduce bug

nzsvz9, could you also tell us which version of Tk you are using.
If it's not (the latest) version 804.035, try upgrading to that latest version and see if that fixes the problem.

Cheers,
Rob