Alright lost in translation. Below a recreated version of the problem. Please pardon that class 1 & 2 look identical here, in code how they use the return value of myCommonLib::bar is where they differ. I'm providing 2 versions of myCommonLib.pm because I've tried it multiple ways, both produce the same error, that function class2::bar() doesn't exist.

#  This is tmp.pl
use strict;
use warnings;

push(@INC, 'c:\perl\programs');  # this is where all code lives

use class1;  # Note, switching order here flips the error to class 1
use class2;

my $C1 = new class1;
my $C2 = new class2;

$C1 -> FOO;
$C2 -> FOO;  # This line hits the error "undefined Class2::bar"
# End tmp.pl file

# start class1.pm file
package class1;
use strict;
use warnings;

use myCommonLib;  #Contains function bar()

sub new { ... }  # builds an object, blesses it etc

sub FOO
{
   bar();
}

1;
# End class1.pm

# start class2.pm file
package class2;
use strict;
use warnings;

use myCommonLib;  #Contains function bar()

sub new { ... }  # builds an object, blesses it etc

sub FOO
{
   bar();  # This line errors.
   myCommonLib::bar();  # Produces the similiar error that
                        # "myCommonLib::bar()" doesn't exist
}

1;
# End class2.pm

# File myCommonLib.pm  Version 1
use strict;
use warnings;

sub bar 
{
   print "hello world";
}
# End file myCommonLib.pm  Version 1

# File myCommonLib.pm  Version 2
package myCommonLib;
use strict;
use warnings;

sub bar 
{
   print "hello world";
}

1;
# End file myCommonLib.pm  Version 2
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