Difference between 5.005 and 5.003 builds

1.) You're not alone; I've noticed this also, and so have (see 3b,
below) have many others.

2.) Simplest case you'll get the message on:
use strict;
my($line);
open(FIL, "somefilehere");
while($line = <FIL>) {
   yada, yada
}

will give the message as described.

3.) Two ways of getting around it:

3a.)
use strict;
my($line);
open(FIL, "somefilehere");
while(<FIL>) {
   $line = $_;
   yada, yada
}

3b.) Upgrade your perl!!! With the standard version 5.005_02, the
error goes away (I don't use the active state stuff, so I can't tell
you what the case is).  Unless you really need the object stuff, it's
probably best not to be using it in production in any case (same for
threads, IMHO)