Can’t add social media image as from 1.0.50

I can’t add or delete a social media image using version 1.0.50. If I roll back to 1.0.49 it works fine. Roll forward to 1.0.50 again – doesn’t work.

I’ve given you a login for a test copy of our site. It’s left at 1.0.50. Edit a “Property” (I used the first one.) There’s an image already there. If you try to delete, nothing happens. If you press the Add Image button nothing happens. Normally it would bring up the media uploader – with or without an image there. Roll back to 1.0.49 and things work fine.

This is all on a Mac OS Catalina using both Safari and Chrome.

Can you help (or fix urgently), please?

Thanks.