Ok, final update.
I manually delete/add all of the photos that were having a problem with the web interface. Now that is resolved. It took a couple of hours, but it works.
Now, I am going to go through all of the ones that do not show up on the iPad app (same placeholder icon), and do the same thing. I expect another day of work on that.
Then to keep my fingers crossed that some other photo doesn't come up badly in the future.
Good luck guys!