Floating Action Button suddenly disappear in run mode!

Hi, do not ask me what happened but I am not able to understand what is going on.

I am developing an application and I user FAB for each page, suddenly in run mode ALL the FAB are not any more visible. They are there and I can click them but not visible at all!!!

I paste a couple of screenshots as example.

in the second screen in run mode you can see also a vertical band on the right the cover part of the "debug" label and the buttons.

What is strange is that if I put it in the middle of the screen it is visible, it looks like there is a mask on the bottom ...

Of course I have tried to delete and create it again, ALL the FAB are not any more visible in run mode but they are in Preview mode ... really strange ...

Any idea?

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