This is bizarre to me, but I have created a child theme of Boilerplate and when activated, the search functionality doesn't work, just returns all posts regardless of the search term entered.
I didn't change anything having to do with the search that I can think of. If I activate the Boilerplate theme, it works, if I activate my child theme based on Boilerplate, it behaves as described above.
Tried deactivating all plugins and same result. It's driving me nuts... any ideas?