Hi,

is there a trick for upgrading from version 1.6.15 to 1.7.0 ?

OS: rocky linux 9.7

What is there:
- I installed php 8.5
- MariaDB 10.5 database server
- nginx-1.20.1

I have set in nginx the root to
/usr/share/nginx/html/roundcubemail/public_html

downloaded from roundcube.net
roundcubemail-1.7.0-complete.tar.gz

tar xvfz 
roundcubemail-1.7.0-complete.tar.gz
cd 
roundcubemail-1.7.0
./bin/installto.sh /usr/share/nginx/html/roundcubemail

Everything went without errors. 
When i now go in the browser to the login website, 
i do not see any logo, just the pure 


------------- begin website output ---------------------------------


Roundcube Webmail Login

Logo

Roundcube Webmail

------------- end website output ---------------------------------
I can login with my username and password. But what i see there is no graphics either.
Clicking on "Logout" gives me:


------------- begin website output ---------------------------------

REQUEST CHECK FAILED

For your protection, access to this resource is secured against CSRF.
If you see this, you probably didn't log out before leaving the web application.

Human interaction is now required to continue.

Please contact your server-administrator.


------------- end website output ---------------------------------

The error log tells me:
[19-May-2026 17:00:19 +0000]: <pknr7595> PHP Error: Request security check failed in /usr/share/nginx/html/roundcubemail/program/include/rcmail.php on line 1233 (GET /?_task=logout)


What did i do wrong/oversee? I think i did everything the instructions say.
Until 1.6.15 everything went like charm.

With kind regards and many thanks for any hint, ulrich