Your problem is this: in your sub process_rows you are assigning the values to $w and $w refers to the label holding the state value. Actually all the values in each array are getting (re)assigned to it. The solution is to have a unique name for each of the labels. You can do it using an array. See my modification below (and notice that each label is identified by an array element of @w:

use Tk;
use Tie::IxHash;
tie %hash, "Tie::IxHash";
my $i=1;
my @w;   #array to hold labels

my %hash =(
1=>["Sappy",
"Jewell",
"2515 E Princeton",
"Visalia",
"CA"
],
2=>["Roomy",
"Hilton",
"12803 Westledge Ln",
"Fifa",
"Transvania"],
3=>[
"Lala",
"Deena",
"423 Northland Street",
"St. Louis",
"Misery"
],
4=>[
"LOLO",
"Homy",
"444 Wold City",
"Foxy",
"Flowerida"
],
);

my @fields = qw/First_Name
Last_Name
Address
City
State
/;


my $mw=MainWindow->new (-title=>"Data Test");
my $rec_no=keys %hash; 

my $label = $mw->Label(-text=>"$array[$i]");
$label->pack;
my $t=$mw->Scrolled("Text",-width=>50,-wrap=>'none')->pack(-expand=>1,
+-fill=>'both');

$w[0]=$t->Label(-text=>"$fields[0]",-relief=>'groove',-width=>20);
$t->windowCreate('end',-window=>$w[0]);
$w[0]=$t->Entry(-width=>20,-textvariable=>\$hash{$i}[0]);
$t->windowCreate('end',-window=>$w[0]);
$t->insert('end',"\n");

$w[1]=$t->Label(-text=>"$fields[1]",-relief=>'groove',-width=>20);
$t->windowCreate('end',-window=>$w[1]);
$w[1]=$t->Entry(-width=>20,-textvariable=>\$hash{$i}[1]);
$t->windowCreate('end',-window=>$w[1]);
$t->insert('end',"\n");

$w[2]=$t->Label(-text=>"$fields[2]",-relief=>'groove',-width=>20);
$t->windowCreate('end',-window=>$w[2]);
$w[2]=$t->Entry(-width=>20,-textvariable=>\$hash{$i}[2]);
$t->windowCreate('end',-window=>$w[2]);
$t->insert('end',"\n");

$w[3]=$t->Label(-text=>"$fields[3]",-relief=>'groove',-width=>20);
$t->windowCreate('end',-window=>$w[3]);
$w[3]=$t->Entry(-width=>20,-textvariable=>\$hash{$i}[3]);
$t->windowCreate('end',-window=>$w[3]);
$t->insert('end',"\n");

$w[4]=$t->Label(-text=>"$fields[4]",-relief=>'groove',-width=>20);
$t->windowCreate('end',-window=>$w[4]);
$w[4]=$t->Entry(-width=>20,-textvariable=>\$hash{$i}[4]);
$t->windowCreate('end',-window=>$w[4]);
$t->insert('end',"\n");

$next =$mw->Button ( -relief=>'raised', -text=>"Next >>", -state=>'nor
+mal',-command=>\&next );
$back =$mw->Button(-relief=>'raised', -text=>"<< Back", -state=>'norma
+l',-command=>\&back );

&process_rows();
print Dumper(%hash);
MainLoop;

sub process_rows{
    if ($i ==1){
        $back->configure(-text=>"Back", -state=>'disabled',-command=>\
+&back);
        $next ->configure(-text=>"Next >>", -state=>'normal',-command=
+>\&next);
    } elsif ($i == $rec_no){
        $next->configure(-text=>"Next", -state=>'disabled',-command=>\
+&next);
        $back->configure(-text=>"Back", -state=>'normal',-command=>\&b
+ack);
    } else {
        $next->configure(-text=>"Next", -state=>'normal',-command=>\&n
+ext);
        $back->configure(-text=>"Back", -state=>'normal',-command=>\&b
+ack);
    }

    for my $k (0..4){
        $label->configure(-text=>"$i");
        $label->pack;
        print $hash{$i}[$k] . "\n";
        $w[$k]->configure(-textvariable=>\$hash{$i}[$k]);
        $t->configure();
        $back->pack(-anchor=>'center', -side=>'left');
        $next->pack(-anchor=>'center', -side=>'right');
    }
}

sub next{
    $i++ unless $i == $rec_no;
    &process_rows();
}
    
sub back{
    --$i unless $i == 1;
    &process_rows();
}
[download]

Hope this helps,
davidj