Drop shadow border on edge of new document?

[keithm1972]

I've noticed the edges of new documents having this thicker black border that looks a bit like a drop shadow. It didn't used to be there to my knowledge. Anyone know if I changed one of my settings? It doesn't appear to be causing any problems.

[SJRiegel]

I think it was always there -- it indicates the bottom and right edges of the docuemnt, and it does not print.

[rob day]

It’s always been there when the View>Screen Mode is set to Normal, this is from CS6: