use lib "MyTest MyModules";   # wrong - a string!
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is certainly wrong, that should be

use lib qw(MyTest MyModules); # correct - a list.
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use lib "/home/.../MyTest /home/.../MyModules"
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in the script version which produced that output. So what looks like two directories is just one - with a blank in it :-P

To illustrate:

qwurx [shmem] > perl -le 'use lib "MyTest MyModules"; print for @INC'
MyTest MyModules
/home/shmem/perl/lib
/usr/lib/perl5/5.8.8/i586-linux-thread-multi
/usr/lib/perl5/5.8.8
/usr/lib/perl5/site_perl/5.8.8/i586-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.8
/usr/lib/perl5/site_perl
/usr/lib/perl5/vendor_perl/5.8.8/i586-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.8
/usr/lib/perl5/vendor_perl
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_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}