Can someone please tell me if the A6 Template class .OBJECT, climbing ladders really works?

I have placed two (mdl)blocks, added the start and finish actions, entered the exit 'Z' value, but nothing happens!

I have tried fiddling with all the different setting, but to no effect.

If it works (and it should) could someone please run me through how to set it up?

I have been nearly a week now trying to 'climbe', and am losing my hair!
David