We recently performed a full restore of an application from a SQL backup in APEX. After the restore, one of my pages was displaying incorrectly - some of the buttons were missing. I tried restoring that page from a separate page-level backup, which failed to fix the problem.
When I open the page in page designer, the main region doesn't display in the center pane and shows as having an invalid template:
Changing the template allows my region to display, but then I get an error saying that I can't save my changes!
Reloading the page does not fix this issue. I am completely stumped on how to proceed from here - I really don't want to redo this entire page!