It took bit of digging and in the I worked out that the problem lie with Mod Security server plugin that improves security and can sometimes break features..
The big thing that confused me is that only certain word combinations caused issues.
The idea behind Mod Security is that it has series of rules that are applied when different things happen on your website.
This is great in theory and it relies on the fact that you do not do certain things, and these are things that some dynamic systems need to do..
The way to fix the issue was to disable certain rules for certain scripts on the site, thus allowing the desired behaviors to occur..
I am not guru except eventually I worked out, that on my server, I could edit the files found in usr apache conf modsec2 so that they do what I want.
I was unable to upload photos using the editor and I was sometimes unable to edit posts and pages.
The problem with BBPress is that posting replies did not always work it was causing error 500.
It took me while to realise ModSec was the issue with BBPress, unfortunately the rules are not exactly the same as for WordPress.
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