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I noticed now again that our calendar was not reachable and returned a 404 error. It is by far not the first time that this happened, I suspect it happens from time to time (approximately once after a few months) after a plugin upgrade.
Once I notice this I usually deactivate the calendar plugin and reactivate it immediately after it. It always worked after this.
I know that it is not easy to analyse the problem with this information but at least I want to let you know that there exists a problem (even in the current and newest version).
The page I need help with: [log in to see the link]