I installed with the 1 click install on dreamhost. I notice that dreamhost mentioned auto upgrades. I have version 1.1.5. Is there a "upgrade switch" that needs to be turned on?

Several dreamhost users have installed zenphoto on their own to get the current version. Perhaps one will post the details.

Dreamhost DOES NOT install ZP into user's directory when doing the one-click, that's how they do updates but most likely major: 1.1.5 to 1.1.6 to 1.1.7; not nightly builds. All files reside on their servers. So, if you want to keep current, do-it-yourself. It's easy, especially compared to some of those others offered by DH.

I created a new subdirectory but used all the info DH creates when they do the install: the SQL db, the password, etc.