I'm running a DAViCal server with several clients (CalDAVzap, CalDAVSynch (Android) en iPad).
Recently I needed to reschedule a number of appointments. I did this using CalDAVzap. The changes included things like replacing repeating appointments by non-repeating appointments, and the other way around.
A short while after I completed the rescheduling the changes were synched to the iPads but the changes did not show on Android, despite several automatic and manual synchs. To be more precise, the removed entries were removed, but the replacement entries did not show up.
As a last resort I removed the CalDAVSynch account (with all data) and re-established it. After the initial synch the Android calendar was okay.
I'm aware that this kind of problems are very hard to find and solve. But is there anything I can do to help?
-- Johan