XF 2.2 Cannot change number of characters in messages to unlimited

As I said in your ticket, you need to open Chrome, press F12, select the Console tab, then attempt to set the value.

An error message should be present in the inspector window.

I'm guessing it's going to be a 403 error.
 
The server is returning 418 errors.

Your host will have to investigate and resolve it. It’s probably some sort of enhanced security causing the problem.
 
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