One of my pages was displaying a cropped version of the post thumb instead of the proper header image.
To fix this I had to deactivate APT plugin, edit the page, remove the thumb, and update. This fixed the page.
After I re-activated APT plugin the page stayed fixed.
I poked around a little in the plugin and I don't see how it could have messed with the header image.
Has anyone else seen this behavior?
Or, perhaps someone has a clue on where I could look to unravel what was happening to prevent it in the future?