New products and even existing products that are opened to be modified could not be saved in Magento 2.1.6. There is not JS error thrown, the Save button just does nothing. No request goes out on the network either.
Re-indexed, re-cached, re-deployed contents, without errors. The only thing I've done is that I've upgraded from Magento 2.1.2 to 2.1.6.
What could be the problem? Ideas to figure it out?