Calendar problems: no alerts showing

[John Sankey]

Over the past few updates, Calendar has gone from showing alerts solely at the time of alert (not showing them if the system is restarted after the alert time and before the event) to showing only that there is an alert (requiring Calendar to be activated to see what the alert is for) to now showing no alerts at all. I want to see each alert, labelled, from the time the alert is to start until the event time, whether the system has been restarted or not. How can I do this?