When it is time for a new task to display on office reminders, it will not show up unless I shut down or restart my Mac.

I have a similar problem, often when I have woken my MacBook Pro up from sleep, and I have to quit Office Reminders and restart it to get all Reminders to show. 

This is one of many rather crucial shortcomings I have experienced with Office Reminders, I have found it  fundamentally unreliable as a reminder tool and therefore of very little use.  I'd appreciate any suggestions for an alternative that works properly.