Thanks for your kind and quick response. I have visited the first link, which humorously acknowledges the issue and states that BB has no fix as of yet, but are working on it. It suggests to attempt a sync of one or the other (contacts or calendar) but not both simultaneously, but I've tried that many times to no avail. I will check the second Knowledge Base link and see what I can find.
I just want to be able to do with my Z10 what was a breeze to do with the four different BBs I've had in the past then years...sync my contacts and calendar! Ugh!