Reminders have failed to pop up for three events this month. I don't see anyone else on this forum with the same problem; it must be something I'm doing. Does it confuse VueMinder when I open 'this occurrence' and mark it 'completed' prior to the reminder time? I've spent a couple of hours trying to figure out what's wrong, and that's the only possibility I've found. Each of the failures was for a recurring event, and it's likely that I marked each 'completed' ahead of time in the previous month in order to prevent the reminder from popping up -- but I'm sure I was in 'this occurrence' when I did that.
There are two events (bill payments) in the last week of August that I have completed today. I noted that after I opened 'this occurrence' and checked 'complete,' the balloon tooltip still indicated that a reminder would pop up on [date].
For now, I am just going to un-check the reminder in 'this occurrence' as well as to enter a note in the description when I have completed an event ahead of time. If you know of anything else that could be interfering with my reminders, please let me know.
P.S. I'm not using desktop reminders.