Solved The Action button for respond or quite or edit gives Error

In which language do-you have wrote on our screenshots ?

There is another issue on your issue, when i try to open a topic which is unread it gives me an error page :

404 View not found [name, type, prefix]: topic, html, site

I haven't changed any language settings now if all is well site and administrator are in English language. but the message that I myself as a test post there in my forum is Dutch (or is that not what you mean)
A I get it I had made messages with user Ashley But when I log in as adminleendert, I also get an error
I also did Synchronize Users but it doesn't help either so maybe i have a setting wrong somewhere so that others not users can do nothing?

now very special when I log in at the kunena screen clicks mark all read then
I can suddenly open the message with admin again etc
I couldn't find any differences between settings Ashley(Registered person) and adminleen(superuser)
ps 
maybe that will help you too so you can read and edit messages

The undread topics have this kind of url : www.kunena.org/forum/general-questions-a...n-the-website/unread with the unread at the end, if you remove the unread at the end you will able to open the topic

I'am not able to reproduce the issue localy with unread topic which give the 404 error

I also tested the live site locally in wamp and there wasn't that problem.
so that's why I'm thinking about setting up my hosting environment.
so I'm curious if you post a new message on my forum Or reply to a topic if I encounter that problem again

I have reproduced the issue of 404 error when clicking on unread topic, so the fix for it is here : github.com/Kunena/Kunena-Forum/commit/cf...da2a43fe22629382cfdb

I edited this this morning for the test live site. so i can try to see if problem is gone
It works now
The only thing that strikes me is that when I've read them the message that there is a new message is not cleared.
Not even if I select everything and then click the read all button.
I can do that separately with a registered user  then is gone
but as administrator it stay