Owncloud shared calendars

Hi,

I am working with em Client 6.0.24928.0, 7.0.26687.0 and owncloud 9.0.3 (stable).

Me an my wife share our calendar to each other, so normally I could see my calendar, the owncloud birthday calendar and the calendar of my wife.

Since a few month em Client is showing only my calendar (no birthdays and no calendar of my wife). In the WebGUI of owncloud and on the smartphone (Android) using aCalendar I could see all 3 calendars. On 1 computer I can also see the 3 calendars, but on 2 Computers I can only see my own calendar.

Is there a way to tell em Client to show all 3 calendars?

Regards,
Falko