Lumia 635 vs. 14393.5 - constant nav bar makes the phone useless

Hi,

With the update from 10586.494 to 14393.5 the Lumia 635 became useless. Completely useless.

The nav bar is constalntly on and hiding the menu items on ALL apps, including built-in ones, like camera, calculator, phone dialer... all.
The phone became useless instantly.

Previously, the nav bar was outside of the system screen, now it became the part of it.

I cannot switch it off or hide it

WHY?????

Please fix it or it will be in the bin in a week (and I think I will not be the only one).

Thanks
J

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