Issue in images show after upgrade (no lightbox)

[EarthDog]

Hi!

I test upgraded my forum and i think there is an issue regarding the images that are in the posts.

When i click i dont get them to show in lightbox but on a new tab.

If i insert a new image then it shows up ok.

If i edit the post and remove/ add again the inserted image then it works again.

Is there any easy fix on this?