From the author:
FYI, the Calendar plugin ONLY shows the NEXT appointment you have from the current time to midnight on the current day. It does not show all appts for the day as screen real estate is at a premium (maybe a future version will have this option). Same with the Tasks plugin, it shows the next task that is DUE for today. It does not show all tasks due for today for the same reason as above (again, maybe an option for a future release).
It does take some getting used to.