I made the following changes * Disable "Recommend extensions as you browse" * Disable "Recommend features as you browse" * Disable "Top Sites" * Disable "Recommended by Pocket" * Disable "Highlights" * Made @google the only search shortcut * Set "Send websites a “Do Not Track” signal that you don’t want to be tracked" to always * Cleared all cookies and site data. Permanent Private Browsing Mode is on. https://messages.google.com/web/ is a completely blank page. I have no idea how any of these changes could have caused it to fail.