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