I found out that php 8.5.9 is running on your webspace.
I have CMSimple 5.23 running under php 8.5.9 offline with no problemes, incl. working logout
Maybe your update was not done complete, which ftp program do you use?
Gert
facebook: the meeting point ebay: the market place CMSimple: your home at the www
Impressum - Legal Notice | Datenschutzerklärung - Privacy Policy
Have you cleared the cache after the update?