Alright. I replaced the /zp-core/plugins directory with the one from the May 3rd nightly build, and that took away the errors in the plugins admin page.
Now, however, I get two errors when looking at an image:
This one shows up at the top, above the breadcrumb.
Warning: Invalid argument supplied for foreach() in /home/content/b/j/a/bjancewicz/html/ZenPhoto/zp-core/template-functions.php on line 177
This one is at the bottom, where the comment field used to be (it disappeared).
Fatal error: Call to undefined function printImageMap() in /home/content/b/j/a/bjancewicz/html/ZenPhoto/themes/default/image.php on line 62
You can see this in action here:
http://zerflin.com/ZenPhoto/index.php?album=artwork/Vector%20People&image=Tamikas%20Mural%20outlines.jpg