Weird general warning errors - then Talk App Conversation body problem

25th Nov - I had an out of the blue load of warnings, one red and a lot orange when logging in and running Administration Settings. The red one was " `Your web server is not yet properly set up to allow file synchronization, because the WebDAV interface seems to be broken" followed by a page of equally serious sounding warnings about no internet connectivity and more. I had done zero updates/changes since previous perfectly normal login. On 26th folowing a server reboot I went to login but first was taken to a page that said various ‘fixes’ were being done, the Element app was one thing being fixed but there were more. When all done I could login and presto, no warnings bar one saying that a cron task was overdue. Today that cron task has rune and there are no warnings, the green tick is back. However… now I have a weird problem with my Talk client on Android and the same problem with a standalone clent on a windows 11 laptop. I see the most recent text in the conversation ‘header’ against the contact but nothing in the body of the conversation. The app withing the Nextcloud installation is working fine though and the current recipient I am chatting to has no problem on his android app. So… puzzled and stuck for an answer - anyone else had either or the above weirdos over the last few days??
NC 30.0.2 - Ubuntu Server 22.04 - PHP 8.3 - Nginx 1.18 - access via Firefox 133.0 - standalone windows client 0.33.0 - andriod talk version 20.0.5

For you webdav errors, do you use the recommended configuration for nginx from the documentation?
https://docs.nextcloud.com/server/stable/admin_manual/installation/nginx.html

And your php version has all required modules installed?
https://docs.nextcloud.com/server/stable/admin_manual/installation/php_configuration.html

If it has been working before … regarding the nginx config, that can change a bit over versions (especially if you use it since a few versions). Normally with php working fine and the nginx being set up correctly, there should be no webdav errrors. (if you have reverse proxies etc., this can get more tricky, but you didn’t mention any).

If you still see problems, I’d try to reduce to a just the basic apps enabled and try if it is working and if not getting it to work. And then start working on getting the apps to run.

If you still encounter problems, check your logfiles, sometimes they tell you clearly what is wrong.