ProgressBar woes

I'm having some weird behavior w/ ProgressBar that I hope
someone can shed light on.
(WinXP, AS 5.8.3, Perl/TK 804.027 + patches)

My (rather large/complex) application is building many dialogs
and widgets at startup, and withdrawing them for later activation.
In this process, I attempt to embed a progress bar in a filesave
type dialog:

my $progress = 0;
$hw->Label(-text => 'Save Progress:',
	-font => $style->{_labelfont})
	->grid(-column => 0, -row => 6, -sticky => 'e');
my $pframe = $hw->Frame()->grid(-column => 1, -columnspan => 4, -row => 
6, -sticky => 'w');
$obj->{_progress_bar} = $pframe->ProgressBar(
	-troughcolor => 'white',
	-colors => [ 0, 'blue' ],
	-anchor => 'w',
	-gap => 2,
	-width => 20,
	-length => 200,
	-relief => 'sunken',
	-variable => \$progress
	)
	->pack(-fill => 'x', -expand => 1);

Note that the enclosing dialog uses a grid layout, but when I attempted
to grid() the progressbar, it appeared as a very large square, rather 
than the explicitly specified length/width; when I added a Frame and
pack()'d the bar into it, it appears OK.

However, when the progress bar is created, its choking on the -variable
with the following msg:

   DB<1> c
Can't set -variable to `SCALAR(0x59fd4e4)' for 
Tk::ProgressBar=HASH(0x5b72110):
Bizarre copy of ARRAY in leave at C:/Perl/site/lib/Tk/Trace.pm line 89.
  at C:/Perl/site/lib/Tk/Derived.pm line 294

  at C:/Perl/site/lib/Tk/Derived.pm line 306
  error:Bizarre copy of ARRAY in leave at C:/Perl/site/lib/Tk/Trace.pm 
line 89.

I've stepped thru the variable() method, but can't understand whats 
causing Tk to bark.

So I removed the -variable spec, and used explicit ->value() calls
to set the value, and things startup OK. But when the application
exits, I get a similar error in the ProgressBar::Destroyed()
method, since it appears to expect the -variable to have been defined,
and doesn't check for its existance before calling
$c->traceVdelete($var). When I added a test for existance, ie,

$c->traceVdelete($var) if defined($var);

then it exits quietly.

Note that I've copied the example from MPTK and run it wo/ problems.

So my questions:

1. Is -variable a required parameter ? It doesn't appear to be,
assuming I use either configure(-value), or the value() method.

2. Is there a current set of patches for ProgressBar that address some 
of these issues ? Google didn't turn anything up wrt 804.027.

3. Any ideas wrt the odd sizing behavior inside a grid ?

TIA,
Dean Arnold
Presicient Corp.

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