I am using the absolute path...see more detail below
PowerGallery uses the absolute path, so as long as your sub domain is a sub folder of the main domain, then it should work, otherwise you will need to have a separate power gallery for your sub domain. 
That's how I have it set up. See description below
I use Godaddy.com hosting.
1. Main hosting account is called let's say "main.org"
When I upload the Power Galley files to the main hosting account "main.org" (in the html default folder) the install of the PG works. See below for the setup that works:
main.org
html
pg(this is where I put my power gallery files)
I then go to main.org/pg and go through the install steps the Power Gallery works.
2. Now when I activate another domain I have in my account on the same hosting plan and create a subfolder for that domain, i.e.:
main.org
html
amused2deathorg
pg(this is where I put my power gallery files)
I then go to main.org/amused2deathorg/pg and go through the install steps the Power Gallery does not work.
I am going to stop testing this and leave all information up where it is so you(webassist) can see what is happening b/c I have tried this many times with the same result. I have also tested on another subdomain to see if the specific domain amused2death.org was the culprit. I tested on amused2death.net as well which is where my files are active now. The links the admin section provides are below.
main link after clicking preview at the top of the admin page
index.php?gallery=1&theme=dark
Direct Link to Your Gallery
index.php?gallery=1&theme=dark
Embed in PHP Page
<?php
$pg_id = '1';
$pg_theme = 'dark';
include('/home/content/e/r/n/ern13/html/AMUSED2DEATHNET/pg/galleries/ribbon_fullsize/index.php');
?>
If someone has had the same issue or if someone else can try it on a another domain on the same hosting account if they use godaddy.com to see if they can recreate the problem I am having and hopefully help me resolve this I would appreciate the help.
Thank you,
Ernie
