Question Editing not working anymore

Editing new arguments or replying to existing posts doen't work: It worked two days ago, then it is not working now.
Looking into the page with "inspect", i see this: 
<textarea class="span12" name="message" id="message" rows="12" tabindex="7" placeholder="Inserisci il tuo messaggio qui" style="visibility: hidden;">    </textarea>
Visibility: hidden is probably the problem. If I remove it, the box for editing appears and works.
Is there a flag somewhere that i maybe set wrongly?

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All kind of editing, inside the forum, is impossible: replying, opening new arguments, citying, ...
Any suggestion on checks to do for understanding? 
In the backend, everything is public, in the configuration, in the template, for the users, for the menus, ... I don't know what else look for.
Thanks
Fabio
 

Editing new arguments or replying to existing posts doen't work: It worked two days ago, then it is not working now.

It would be strange if a mistake suddenly occurs for no reason. Have you changed or installed something in this time?

I agree Rich.
By the way, I did not install anything. Maybe i changed some setting (which i don't remember exactly), trying to fix the other small issues i'm having, but for sure nothing so relevant to block everything, i guess. It worked till two days ago, even other users wrote something in ... 
It seems to me the point is the "visibility: hidden" which is preventing editing, but i don't know where this is set.

Use you an optimization tool or page compression via the Joomla template?

this seems to be the line giving the error 404 - not found:
www.formeeriforme.it/index.php/kunena/tu...tor_config.js?t=KA9B

 

My template is based on Astroid Framework, using bootstrap 4 I think.
By the way, i disabled all the related minimization procedure:   *bootstrap*, *.min.js,

 

It wasn't what I meant, the .min files are ok. There are extensions such as jch_optimize and also many Joomla templates contain already optimize options. You find this in your Joomla template setting. Such templates should also have an option to exclude files.
In this case you would have to enter to the exclude field this path: /media/kunena/core/js/ckeditor.js

All suggestions didn't work
I tried downgrading template version: with Blue Egle V1.5.5 the editor problem disappeared 
Looking forward for a new version of Blue Eagle fixing definitely the issue with all improvements included in V1.6.2
Fabio

Looking forward for a new version of Blue Eagle fixing definitely the issue with all improvements included in V1.6.2

Please wait also with the update to Kunena 5.2.3 until Blue Eagle 1.6.3 is ready.

I've been trying :
with purity_iii (with and without js optimization)  : same problem (even exluding /media/kunena/core/js/ckeditor.js  from optimzation)
with T4_blank template (with and without JS optimization) : same problem 
kunena editor works for some people (whatever exploitation system or navigator) but not for others
I've beeen trying a downgrade to kunena 5.2.2 => doesn't make any change

Just try, on my PC : doesn't work anymore with firefox or chrome BUT works with edge....