Hi,
ok, I know what you need to do:
--Delete the audioPlay script that is present at the root of the Project assets. Then double check that you have no errors in the Unity console, if you do, Playmaker will not be able to initialize properly, hence why you can't launch any playmaker editor or views.
It worked for me, I could play it in Unity 3.5 with playmaker 1.4.4 ( from the asset store)
bye,
Jean