Copy the text in story editor, if it isn't threaded to other frames, and delete the spread. Recreate the spread with new pages and past eth text you copied, or relink the text frames.
Thanks, Peter. Followed your suggestions.
Wish I understood how it happened and why I couldn't move or resize those boxes, but I'm just happy to be able to get back to work on it now.
You didn't mention your version, so I can't say for sure, but it sounds like a bug we've seen a couple of times now.
Yes, I should have mentioned that:
InDesign CC 2014, 10.2.0.69