4.4.4 killed calendar on my note 3

Is your calendar data in google calendar or otherwise "in the cloud"? If so, you should be able to remove all synced items from calendar (it's under settings, accounts, tap each account and uncheck calendar), then clear calendar data and cache. Reboot.

Launch calendar app. Should work since nothing is in there now.

Re-add synced calendar items. Cross fingers. Launch calendar.

Thanks, that was a good idea.  

Oddly, I don't see "calendar" of any type under any of the sync accounts - not even under the Google account, which seems particularly odd.

Under the Google account, I disabled all synchs except I kept Docs, Drive, and Sheets.  They synch fine individually, but I notice that when I try "sync all" from the account page, it says "Sync is currently experiencing problems.  It will be back shortly."  Is there a synch utility that should be running but is perhaps not?

So you don't have any calendars syncing? Odd.

Try a reboot (just a simple restart) to see if that clears up the sync issue. I've seen google sync get wedged if you change account info on it.

Thanks for the tips.  

So, turns out this new Calendar from Google is working well.  But the old calendar that was installed on the phone won't uninstall and when it runs, it crashes.  So, I've turned it off under settings->application manager.  But I wish I could remove it.  Not willing to go through a factory reset or anything that drastic.  Anyway, it's all working now and I'm content.  

Thanks again for the great suggestions.  Much appreciated.