Sorry to post about this twice, but I’m still having problems with the lightbox and I have more information now than I did two years ago. Since I have a lot more photos uploaded, it is imperative that I can credit them properly. The lightbox does work at seemingly random times, but not for every page at once and it stops working if the page is refreshed.
Plugins - I have uninstalled all of the plugins except for Simple Pages, Exhibit Builder, CSS Editor, and the plugins created for Curatescape. I might be able to translate my exhibits into tours, but I’m need to have simple pages and the ability to customize the CSS.
Dublin Core - I think that I have the needed fields filled out correctly. I haven’t added them yet for every single picture, but there should be enough there to figure out the problem?
Some of the links on your site use the /omeka/ path and some do not, which is why it seems like the issue is somewhat random, but it’s actually consistent.
Moving your installation up a level from the /omeka/ directory is probably the easiest way to solve this. So instead of the site being located at, e.g., /public_html/omeka/ it would be at /public_html/.
There are also ways to fix this using the root .htaccess file. You might try something like the following (not tested, so you may need to search the web if it doesn’t work).
Also, it looks like you’re using an older version of the theme. You can browse the release notes for newer versions at the link below. I’m not 100% sure, but I think there is better support for subdirectory installations in the latest version.