I finally got this working by manually entering one set of templates and correcting a typo in the instructions, then using TBS to export/import the proper templates to all of my other template sets.
The typo is in step three of the showgallery.php modifications:
Change:
pp_showgallery_showsomments
to
pp_showgallery_showcomments
I tried to attach a set of the corrected templates exported with Chen's Template Backup System so those who use TBS can import/export them as they see fit, but cannot get attachments to work using Mozilla Firebird. I will try it with IE and see if it works. x_x.
Ahh, attaching with IE worked.