Originally Posted by OVK

I get the same error message also when logging out with Log Out button. No strange characters in username or password.

Here is the xterm report:
$ /opt/qspot/bin/qspot
Unsupported date format character at 1 (%-d.%-m.)
> set_stream 'QSpot'
SetOfflineMode: true , false
Connection state: 0
Error code: 24
Error code: 24
Logged out
Session deleted

I will next try to uninstal QSpot and delete all user data before reinstall.