Okay, new information. And thank you for your suggestion, BTW. Was a good idea.
Running the install script didn't exactly pan out. After running it, I could use my admin user/pw to log in, however it didn't recognize me as an Administrator. I'd be logged in, but when I'd go to adm-index.php I'd get an error saying I didn't have permission.
Looking in the pp_users table, I saw all users were set to usergroup id 0. I editied my admin login for usergroup 5 and I can now access the admin on the front end. I only have 100 users, so I can easily edit all those to the right user groups manually.
Now, what remains a mystery is my showphoto.php pages still don't display the photo, title, username, etc etc etc. What should I look at to fix?