Its not exactly the Nvidia problem - also some apps seems affect situation and still got charms and original start button disabled ( But now it takes much longer time - in 1.31 Win button and charms are gone after about half an hour or so. Now in 1.40 version about a day or more keep staying.
Great ! And it works fine but after Nvidia updates their GeForce Experience program it requires restart to return Charms and original start menu on second monitor screen. Does it make sense that I have taskbar in the bottom of the first screen and on top on the second ?
In fact the bug looks like on main screen hot conners and charm stop working after time, but on secondary screen keep working fine. Disable/Enable hot conners does not help. Only reboot needed.