The Google calendar that came with my Nexus 7 seems to work fine. The tasks work fine. When I try to sync them to my PC, the tasks show up but none of the appointments do.  If I make an appointment on the PC, it shows up on the tablet. If I add a task on PC or tablet they show up on both.  Appointment made on either, show up on the tablet but appointments made on the tablet do not show up on the PC.

What do I need to do?

thanks
Jack