Roundcube subcalendars not displaying events

[Tobias Brunner]

Hi everyone,

Since a few days no events are displayed from subcalendars (subfolders 
of the main "Calendar" folder) in Roundcube. I can see that there are 
events looking directly at the IMAP folders.
I even can toggle the calendars, but that does not change anything. 
Apache logs and Roundcube logs don't show any errors.
Events of subcalendars are also vanished from all my devices which sync 
with ActiveSync. So there seems to be a problem accessing them in the 
Roundcube libraries. How can I debug this?

My Kolab is running on Debian, the roundcubemail-plugins-kolab packages 
has the version number 3.1.11-0~kolab1.

Any input is appreciated.

Cheers,
Tobias