Okay, after testing different plug-ins, it seems that the error occurs as soon as there are more than 2 plug-ins in the folder. No matter which, it seems.
Oh and even the base URL forwards to Sourceforge. Also, after emptying the plug-in folder and accessing the admin interface, then re-copying over ...

Hi,

this seems to fix the issue. Thanks!

Hi,
I just downloaded the version you provided on the frontpage of the s9y website.
Thanks for checking!
(Plugins: I had updated them before updating the blog via Autoupdater)

I am as baffled as you are :) I even fail to trace the error.
Eben after changing local.inc to 2.5.0, the error persists. Instead of asking to click on upgrade, the forwarder just kicks in directly. But the correct favicon is loaded.
It's just as if htaccess would set Sourceforge as the domain ...

Wonderful, thanks!

Hi,
I tried to update to 2.5, but after uploading teh current version via FTP, and clicking on "Your blog is updating ... click here ...", I end up at the Sourceforge s9y page under https://fuelratart.org/serendipity_admin.php .

PS. Here we go with an example of the floating menu on smaller devices.

Great! Checking.

UPDATE: Feedback: Sadly, the menu still "lags" if I scroll down and up again – there's still a gap between the upper border of the window and the menu.
Strangely, I thought I did fix this using your suggestions ... which is interesting for they had been implemented in user.css ...

Hi!
Sorry I was away. Thanks for your suggestion! I applied the fix you mentioned, and the menu now stays on top of the visible content. Yet if I try to prevent it from scrolling down with the content, I couldn't find a solution through css (position: fixed doesn't do the trick).

Hi!
Sorry I was away for some time. Wonderful, you were right. I automatically assumed the Admin group would include all other membership rights, so i didn't think of checking that ... sorry for your trouble.
Thanks again!

Hi!
When using Clean Blog, the top menu bar hovers at the top of the window when scrolling down, as ist should.
But when I scroll up again, the menu bar "hangs" too low, covering some of the content while more content above it is still visible, instead of clinging to the top of the window.
Example ...

Wonderful, thanks!

After installing the Quicknotes plug-in, unter "Groups", I only get "Administration" (the one I am logged in with), not Editor or one of the other groups. So it works, but notes are visible only to the Admin group.
Screenshot 2025-08-07 at 14.18.22.jpg

@oni opened an own thread as suggested ...

Hi,

okay, this is strange. I checked the Configuration file for the cache option, whether it indeed has been disabled (which it was). I then did nothing more than change the blog's language. And bam, it's working as intended now, front page is correctly assigned.
So my best guess is that there ...

Hi,
thanks for your answer. I emptied the cache. No changes