When I install the latest support build I always get the "Zenphoto has detected a change in your installation. " warning header. It never goes away when viewing as Admin.

Is this normal for a support build? If not, how do I get rid of this?

No problems with the install.

No, it is not. It is a bug sneaked in that apparently does not occur on all servers:
https://github.com/zenphoto/zenphoto/issues/271

getting this here as well

anything you want me to try to see if you can pin it down?

Please see https://github.com/zenphoto/zenphoto/issues/271 There is a test branch and some research questions you could help with.

The current theory is that this is caused by a database condition that leaves multiple versions of the release option, which is not supposed to be possible.