I’m out of ideas now 
I’ll set up a recurring event, then edit a future occurrence to see if I can simulate your experience.
Are you primarily entering events and editing on Google’s web Calendar interface?
Have you tried and eliminated Evolution suggested by @Wimpy
Don’t worry, It’s a vexing issue and is affecting multiple projects and programs. I’m still convinced the root issue is on Google’s end. I really appreciate your help!
I am primarily using the Google Web Interface
I have not had an opportunity to try Evolution yet. Plan to do it when I get home tonight. I’ll report back here and tag both of you 
I used Google's calendar web interface to create a recurring event
Checked TB - it didn't show until I clicked synch
edited event on web to change 1 day
Checked TB - it didn't show until I clicked synch
edited event on web to change another day
Checked TB - it didn't show until I clicked synch
see a recurring theme here? 
Huh! That’s interesting.
I did hit the sync button and it shows over 2000 items synching, but none of them are the missing items.
I’m wondering if this might be some more generic level issue with just that one specific calendar. I’m going to give Evolution a shot as @Wimpy suggested and if that does not work what I may try doing is just build a whole new calandar and rebuild my entries and see if that yeilds any results.
I’m pleased to report that Evolution has synced my Calendar along with the problematic recurring events. IT did NOT sync a lot of my secondary calendars which are provided by Google but I suspect I can manually add them and they can be read only since they are updated by outside sources.
Evolution did not sync my contacts so that’s my next hurdle, but still… Progress!!!
I just tried Evolution on UM 16 in a virtual environment - much easier to set up with gmail and calendar. Looks really nice.
Available for MAC and Windows also
Just use Evolution
sudo apt-get install evolution
It has seamless integration with google services (email, calendar via caldav and contacts via carddav) and even exchange web services (if you use outlook.com or some corporate exchange server). Just setup your gmail account and your done.
If you want to use the account plugin backend you need to install the gnome calendar app to get access to google calendar, gnome contacts and for email you can use whatever you want with imap. If you use this method you need to setup your google account in online accounts prior to use these apps.
Best bet it to use evolution route.