5.1.1 Update has put a black border around the screen!??

[Suthy1]

Hey

I've just updated to 5.1.1 on my Z1 and it has put a black border around the screen effectively making the screen smaller. Anyone got a fix?? Thanks in advance.

[Phy]

Check under 

1. Settings
2. Accessibility

[Suthy1]

Not sure what I'm looking for, doesn't seem to be anything screen related (size). Sorry