A few months ago I had a problem with win10: a blue screen every second boot. I searched the web and found a fix, i.e. to disable the fast boot option in the Power Saving Options. Which I did, and it worked.
A few weeks ago I installed the Falls Creators Update (aka 1709), and now I get a strange behaviour. The Start Menu button (the window icon) is totally insensitive. When I click it, nothing happens. If I reboot (with Alt-F4, or with Ctrl-Alt-Del and Task Manager), all goes well, i.e. after reboot the Start Menu works regularly. However, at the next boot, the Start Menu gets insensitive once again.
As it happens every second boot, I have checked the "fast boot" option, thinking that maybe the falls Creators Update had turned it on again. No, it had not, I found it still disabled as it was before the update.
Honestly, I an not sure whether this problem has started occurring RIGHT AFTER the 1709 update, or a few days later. For sure, yet, it didn't happen BEFORE the 1709 update.
There is a detail that may help troubleshooting: in the sessions when Start menu is insensitive, when I reboot, the system shutdown always shows a message "Task Host Window stopping background tasks \Microsoft]Windows\Plug and Play\Device Install Reboot required".
A device install every second boot? Doesn't make sense...