FYI - The full path to enable the windows+[arrow] function is:
Control Panel\All Control Panel Items\Ease of Access Center\Make it easier to focus on task -- (keyboard works too as mentioned originally - they both take you to the same place).
Then you have to scroll down to heading that says "Make it easier to manage windows". This threw me off at first because the window doesn't look like there's any more content. So scroll down against your better instincts, then the full name of the "prevent" feature listed above is "Prevent windows from being automatically arranged when moved to the edge of the screen" -- make sure it's unchecked... I had to uncheck, recheck, uncheck to get my shortcut to start working again.