Yesterday my agenda suddenly froze (with the spinner showing for at least half an hour. So I did a force quit, and opened it again, and now it just shows this:
The line "Agenda's bijwerken..." translates as "Updating agendas".
It has shown this for hours now, so I don't think anything is going on anymore. Most importantly though, the whole agenda seems empty in the background (and I don't have iCloud backups from the agenda).
Does anybody know what I can do to A) get the events from my agenda back, in whichever form possible, and B) get the Agenda working again.
I'm pretty good on the command line, so messing around in system files won't be a problem for me. I just don't have a clue where to start. If it's important; I'm on OSX 10.11.2.
All tips are welcome!