Thank you as that seemed to solve the problem Please let me know if I did this correctly. I deactivated 5.01 and then renamed the wp-photo-album-plus directory in …/plugins and then copied the contents of the zip file for 4.9.18 into …/plugins/wp-photo-album-plus directory and then activated the plugin. I immediately ran the setup action as you noted and it appears to be working fine now. While this is a workable solution, it leaves us at an impasse with respect to upgrades unless we fully understand what was preventing the plugin from working on the 5.01 version…any suggestions on determining the root cause so that we can maintain the plugin going forward?
