Actual: OwnCloud 8.2.5
Clients: OSX 10.9.5, iOS, Thunderbird
First we updated from version 7 to 8 and then 9. After that we realized that the calendar and addressbook works unreliably. Reading the documentation we found, that calendar and addressbook are alpha state in Owncloud 9. So we got back to version 8. We did it by installing an old backup, and then we set up the database anew, and imported the calendar and addressbook data.
Now we experience that not all of the records are shown on the clients. They are visible on the web interface, but they are not visible on the client.
So, for example, there are 3 repeated events in the calendar. One is shown, the other two not. On Thunderbird, after calling "reset calendar cache", all events are shown for some time, but then disappear again. It is always the same event that is shown, and the same events, that are not shown.
On the Mac, there is no such button "reset", so we cannot try what we did with Thunderbird. But the Mac shows the same one event that Thunderbird shows. And the other two not. It ist no difference, so we think, there is some issue within the owncloud.
iOS is much less affected.
It is the same thing with the addressbook. Sometimes all cards are shown, sometimes not.
We also removed the accounts from the clients and created them anew, but without success.
Has someone an idea about that? We searched the internet, but to no result.