UIToolbar disappears between iOS10.2 and 10.3

We recently have had users reporting that their bottom UIToobar is no longer present. I pulled up the app in xCode on two differenct machines. One that is on El Capitan and only simulate iOS10.2 and another on Sierra with fully upgraded xcode allowing 10.3 simulation. Running the app in 10.2, I can see the toolbar is present, however, simluating in 10.3, it goes way. EDIT: Just to be clear, I see the toolbar in the storyboard layout but once running in simulation and in debug mode view, I see it disappear.


Has anyone else had similar experiences or advice?


Thank you.

UIToolbar disappears between iOS10.2 and 10.3
 
 
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