Problems with the Settings -> Overview page

The Settings -> Overview page seems to have some problems:

  1. Changing the update channel doesn’t save
  2. Clicking the Open Updater button does nothing
  3. Trying to change the groups that get notified for new versions, I get asked for password but when I enter it says “Failed to authenticate, try again”

The other pages seem to work fine. I tried to relogin or press CTRL+F5 hopping this is just a cache problem, but couldn’t make it work. I first encountered the problem when running on version 14.0.2 RC1. After an upgrade to 14.0.3 (with the CLI updater) the problem is still present.

This seems to happen just on this one server. Did anyone encounter something like this or has an idea what to look for?