Factory reset, if you can get to that in the menus. Redo the firmware update, if that is possible.

Hi, I have just updated the firmware on my GFX100s to ver 2.13, and I am having problems. The menu freezes up as you scroll to the Flash Setting. Does not allow me to go to the following menu item. Then, when I power it off, the screen remains on. I have to remove the battery to power it off. Has anyone had a similar issue? Any suggestions. Thanks lingam.

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Auto mode perhaps

I don't know the XT50 but face and subject detect are focus settings and probably focus area is still set to wide/tracking. You might try changing it centre point. Not that I'm sure why it should affect photometry (exposure) settings.....