Intresting, this works for me on the same platform. Can it be something wrong with your Mylog package? This is what I tested it with:

In Mylog.pm:

package Mylog;

use base qw(Exporter);

our @EXPORT_OK=qw(warn test);

sub warn{
  print "My warn ", @_, "\n";
}

1;
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And in t.pl:

#!/usr/bin/perl

package main;

use strict;
use warnings;
 
use Mylog qw/warn/;

warn("just a test... - warn\n");
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Running t.pl, I then get:

[skaark@dhcp-253-59 ~]$ perl t.pl
My warn just a test... - warn
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I cant really help you out much more unless you show me the contents of your Mylog.pm file. I'm guessing the problem is somehow in there.... gc