Thanks aitf311 and sbillard,
A few questions.
If I upload the nightly build, do I just replace the whole zp-core folder and run the upgrade.php per the Quick Upgrade Steps on this page ? http://www.zenphoto.org/# Please tell me if that's wrong.
When I was searching the forums for how to password protect, it looks like there was a password solution under consideration that would only protect the folder URLs but that wouldn't require a password if you typed the photo URL directly into the browser. Is this the type of album protection in the nightly build or is it top to bottom? (I like the htaccess passwords because from what I understand it's a proven technique and applies to everything in the sub-directory.)
If I wanted to go forward with the 2 zenphoto installations, is the config.php the only place I need to modify the prefix for the database? It looks like it to me. Please tell me if I'm wrong.
I'm guessing I can't share folders between the two installations, but that's OK.
Thank you for answering my newbie questions.