That looks like an addon thats causing issue : https://xenforo.com/community/resources/editor-bb-code-manager.5657/
I would try and disable/uninstall the addon and see if that helps
I use discourse for one of my forums and I really like the overlay that appears on the image. It gives me the dimensions,disk space and format of the image. I find this information quite useful
Its gone quiet again from the devs.
Whilst I appreciate that the team are likely to be pushing 1s and 0s around , it would be great to have some form of update from the team. Just a snippet of info or whats being worked on / held up by. Are there any new timelines?
I am wanting to implement...