Code Master,
I couldn't believe what is happening that the same script gives different results on different machines, finally I add the following code to your script:

my $ref = $dbh->selectall_arrayref("
           select name, email from users") || die $dbh->errstr;
foreach my $person (@{$ref}) {
        my ($name,$emai) = @{$person};

$_=$Name;
s/ /_/g;
$Name=$_;

        print "<font color=\"red\" >Name :  $name  </font>";
        print "<font color=\"blue\"> Email : $email </font><br>";     
 }
[download]

Surprisingly, the result is:
Name : Dr._John_Bull Email :

So, it is not DB error, but something else. Do you have any idea how to improve it?
I can live with the "_" insted the " " but Perl beauty suffers.
Best regards,
sOKOle