I upgraded my Magento from 2.0.2 to 2.1-rc3 some days ago, and today I had a strange issue with the Product Search (Products > Catalog) page, I'm getting the message "Attention: Something went wrong" and the searchs stop.
It was working some hours ago, the different thing is I imported some products.
I already flushed cache, re-compile, re-indexed and nothing.
Any help would be appreciated.
UPDATE 2016-07-22 - I was able to fix it, deleting all the products and importing them again. I have no idea what was causing it.