Hi Johann,
Thank you for your quick reply!
I did some more testing by isolating everything on a new installation, and the plugin worked perfectly, suggesting that the problem was on my end.
I found the issue – the latest version of the Resizable Editor Sidebar plugin is not compatible with the Advanced Custom Fields: Table Field plugin, or vice versa.
When I disabled the Resizable Editor Sidebar, the plugin worked fine. Ah, It is quite a handy plugin, especially when dealing with a ton of options in the sidebar. Any ideas on what we could do?
Thank you!