Hello Ferd II,
I just wanted to let you know, I've been tearing my hair out trying to figure out this problem for weeks, to the point I only opened/updated/created-appointments in iCal on my iPhone 5s and NEVER on my MacBookPro Retina.
I'm am so happy to have found this discussion thread and your instruction for the solution.
Simply, IT WORKED!!!!! For the first time, weeks after trying to switch my calendar to iCloud, I no longer have that irritating "update" notification with the horizontal busy bar never going away.
THANK YOU!
Another happy Apple user because the community is so rich with knowledgeable folks.
All the Best!
Carson