This really looks like a grid to me, not a pack. Quickly constructed test:

use Tk;
my $mw = MainWindow->new;
my @tags = qw(name version description date);
for my $row (0..3) {
  $mw->Label(-text => $tags[$row])->grid
    (
     -column => 0,
     -row => $row,
     -sticky => 'e',
    );
  $mw->Entry()->grid
    (
     -column => 1,
     -row => $row,
     -sticky => 'w',
    );
}

MainLoop;
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When you say your experiment with grid "hangs", you might be trying to use both pack and grid in the same container. Don't! If this needs to exist within a larger framework, wrap it all in a Frame, and then pack the frame in the mainwindow.