When I press the backslash key on the black mask, it doesn't show the red overlay. It does turn off the layer visibility "eyes". It has worked in the past but I must have turned it off somehow.
Having exactly the same issue, the 'eyes' toggle on and off, but I don't see the mask overly in red.
Have you gotten any feedback on this?
Please pass along if you have,
Thanks so much
Figured it out. In the mask thumbnail options, I show how managed to reduce the opacity to 0%. Changed it back to 100% and it works fine.
Hope that helps