roundcube out of sync (kolab 3.0 on debian wheezy)

[mistub]

Hi all

I'm frequently encountering lags when deleting an object in roundcube 
(or even reappearence). Actually when I delete a contact the 
corresponding email is deleted immediatly but (after browser reloads) 
the contact still shows up in roundcube for a certain timespan. The 
issue seems to be related to cache. Can someone tell me how to debug or 
even solve these kinds of problems?

Best regards

Michael