Hey Matt,
Thanks so much for the quick reply.
Yes, you are very right. It was from a premium theme acquired from this publisher: https://www.livemeshthemes.com/products/peak-charity-theme/
A developer did get it working (I admit, I’m an admin user managing the site, not a developer). If I understand correctly, the issue ended up being the plugin was updated but WP itself also needed to be updated because of a native WP function called array_insert_after (not sure of the deeper details).
So the export is now working without the array errors.
One of the charity site admins just shared that while exporting, not all fields are being exported as they were previously (yet to verify if that’s a real issue or not. If so, I’ll open up a new topic to share and see what thoughts might come to mind).
Matt,thanks again for the fast and thoughtful response.
Very admirable (many plugin authors aren’t so attentive).
-Dave