MyBB Community Forums

Hey,

we updated our Forum to MyBB 1.8.21. 

Now, we got the following problem. Every Edit, Post or citation is shown as a source code. This made communication within the forum impossible. 

We now went back to one of the older updates, but lost some pieces by reupdating.

Can someone tell me, why everything was shown as a source code and how it can be fixed? 

Thanks in advance for your support.

The same thing happened to my forum upon upgrading.
The solution is to revert all themes.
You can find that somewhat short discussion here:
https://community.mybb.com/thread-223556.html