Yes, and it turned out to be a user error. 😮 😕
It turned out that I had briefly created and used a second apple ID (long story) and the apps that were giving me issues were downloaded with this second ID.
Here is the easiest solution to fixing this:
1) When the app store notifies of an update, select each app individually to update it instead of doing a global update.
2) The app store will prompt you with the password. This will give you a chance to see the apple ID associated to the app.
(It's the only place I've found to see this information. I can't find it in the app's settings anywhere.)
3) Now you have two options:
Option A: Delete the offending app and reinstall with the apple ID you are currently signed in with.
Option B: Sign out and sign in with the apple ID associated to the app, proceed with updates, and sign out/in again as needed.
Note that even if you have "purchased" an app with both (more than one) apple IDs, your device remembers which ID you used when you downloaded the app. So even if you are signed in with an apple ID that purchased the app, the app store will look for the apple ID/pw you used when you downloaded that app. You can solve this by deleting the app and reinstalling as mentioned above.
Another wonderful thing I learned from the best tech support ever is that iTunes Store now has an easy way to view app purchase history:
1) In iTunes, select iTunes Store.
2) When/if it ever loads an hour later, find the Quick Links panel under "Welcome Username" on the far right.
3) About half way down, there is a Purchases link. Click that, and then, on the next screen, Apps.
You can sign in with the alternate apple IDs to compare the apps purchased.
Alternatively, you can see your entire purchase history by date by selecting your apple ID (top right), and then "Account." But that is a longer, more tedious way to scroll through your apps.
I hope this helps and makes sense. Good luck resolving the issue!