Unable to draw walkbehind areas (SOLVED)

[Nixxon]

Hello,

I am seemingly unable to draw walk-behind areas directly onto my backgrounds. I've never had this issue before.

I've been creating objects to get around the problem, but it's a little tedious.

Any help would be greatly appreciated.

Images below -

https://ibb.co/vdtcBM7

https://ibb.co/X3L4VTK


SOLVED:

Sorry, it was only walk-behind ID 1 that was locked. My bad.