I can attach an action to an entity in WED.
It appears in the behavior list and all looks good.
When I run the level, however, the screen is black. I have no error messages, just a black screen.
I have tried many different ways of achieving this simple task but it never works.

The puzzling thing is this, I have done this many times correctly but with a version of 3DGS from about 1 year ago.

I would be greatful of any help please