[Solved] Blank "Loading" box appears when editing Form *and* EDD (Easy Digital Downloads) plugin is activated
I came across something strange. Whenever I have Easy Digital Downloads activated, if go to edit a wpDiscuz form, I get an overlay appearing and a box in the middle that is continuously loading but never displays anything. I attach screenshot. I've now tested it in two separate Wordpress installations (that have different themes etc.) and I get the same phenomenon. Box never appears when I deactivate the Easy Digital Downloads plugin. I tried adding some code suggested from another thread related to wpDiscuz and EDD in my theme's functions.php just in case it would make the box disappear (thinking that maybe that's what the box, if it ever loaded properly, would have suggested I do given I use wpDiscuz and EDD) but it didn't work for that purpose (box still appeared) but only for the purpose it was originally intended (making it possible to add comments in EDD post types).
Any clues as to what it is, what it means, and how to fix it/get rid of it? Obviously keeping Easy Digital Downloads de-activated is not an option.
Btw, thanks for a great product.