I have started testing Omeka Classic v.3.0.1 both as a new install and upgrading existing sites. One issue that I have run across is with the lightbox displays from thumbnail images. On the new site/new install, clicking on the thumbnail does NOTHING. I expect an image to appear in a fullscreen lightbox, with the ability to rotate through multiple image files (if any). The lightbox does appear on my upgraded test site; setup and configuration are identical for both sites.
I deactivated plugins just in case there was some hidden conflict there, but that had no effect. I haven’t been able to find any substantive documentation on v.3 or the new versions of the three core plugins, so am now rethinking upgrading from 2.8. Any information or documentation would be helpful. Thanks!