(I'm using the latest version of Chrome on Windows 10)
Google instant does not work only when I'm signed in to my google account.
That is, if I sign out in any way (or use an incognito window, or another browser, or clear the cache/cookies), google instant behaves as expected. However, as soon as I sign into my google account, google instant stops working.
I've tried going to my search settings and changing Google Instant to "Always show Instant results", but even after selecting save, upon going back to search settings, "Only when my computer is fast enough" is always the selected option. Even as such, the option reports that Instant is "currently on", even though its clearly not:
How can I resolve this? (It turns out I can't live without arrow-navigation through google results, which apparently only comes with google instant).