Question Strange characters displayed in posts

My site/forum has been running Kunena for years.  This problem started a couple of days ago.

What I'm observing at the moment is that if I view a thread while I'm logged out, it displays correctly.  Example:

 

But the moment I log in, the page loses its styles and displays what looks like binary data:

 

It is clear that this does not happen to all users - some users can still view, post and reply on the forum; others are seeing this strange binary data.

My config is as follows:

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208	My Forum Profile	menu-user-k2	view=user	my-forum-profile	No
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227	Forum	kunenamenu	view=home&defaultmenu=229	forum	No
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232	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
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234	Rules	kunenamenu	view=misc	forum/rules	No
235	Help	kunenamenu	view=misc	forum/help	No
236	Search	kunenamenu	view=search	forum/search	No

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Kunena version detailed: Kunena 5.2.6 | 2021-07-25 [ Melia ]
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Looks like from a ftp file. You have in your setting protect attachments = yes. Some browsers have problems with protected ftps and can't decrypt them.
Here are two examples (it's the same post). The first image shows the post with Firefox and the second with Cromium.
I don't know any solution for this. You can only ask your users not to insert ftps in the post. If you add ftps only as attachment, it should work.

 

 

 Looks like from a ftp file. You have in your setting protect attachments = yes. Some browsers have problems with protected ftps and can't decrypt them.
Here are two examples (it's the same post). The first image shows the post with Firefox and the second with Cromium.
I don't know any solution for this. You can only ask your users not to insert ftps in the post. If you add ftps only as attachment, it should work.

Thanks Rich, but I don't think that's the problem.

I've tested with Safari, Chrome and Firefox.  In all of them, it's the same issue:

• Before I log in, the post displays perfectly.
• After I log in, the post displays incorrectly.

Seems to be related to my login status.
 

• Before I log in, the post displays perfectly.
• After I log in, the post displays incorrectly.

It's only an idea, but is it possible, you have a member related extension, where running a script?
Navigate to this message with the broken image and open the Browser console (tab network) and refresh the page.
Count the scripts which running and then login. Compare whether the same number of scripts running.

• Before I log in, the post displays perfectly.
• After I log in, the post displays incorrectly.

It's only an idea, but is it possible, you have a member related extension, where running a script?
Navigate to this message with the broken image and open the Browser console (tab network) and refresh the page.
Count the scripts which running and then login. Compare whether the same number of scripts running.

Hi Rich - thanks for the idea, but I think didn't make myself clear...

This happens on ALL threads and has nothing to do with images - it happens on threads WITH images and threads WITHOUT images.

If I view a thread while logged out, all ok, if I view when logged in, chaos.

I can't see any difference between the number of scripts running logged in or not - but I see hundreds of requests under the network tab, is there any way of filtering to the scripts only?

I used Chrome, Dev Tools, Network tab.

Hi,
does the website sometimes use a security extension or plug-in
such as admintools or adminexille ,securitycheckpro?.
or an optimize extensions ?

and see if all your plugins and extensions are still up to date especially K2 .
I think I see when I click on info on your website it pops out and there is this message with the same strange characters .
and have a look here read