Rereplacer 12.8.3

If you can reproduce this on an online environment to which I can get access, I am happy to look into this.

Can you give me (super) admin and (s)ftp access so I can take a look?
You can use the 'Confidential information' button in the forum editor to hide sensitive information.

What do you mean by "Then all adjustments were gone."

Can you give an example of something that is not working as expected after update, and explain what it is?

You can't here. You can link to or embed images that you have put online somewhere.

Images don't work. They're giving a 404 page.

Ok, found the problem.
It is fixed on your setup and in the latest development release on:
regularlabs.com/development-releases