Thanks @ih8gates.
It seems I can’t trigger a script at all. Perhaps something to do with permissions and the AIO being in a virtual environment. I can see another user having the same problem with it here.
The random music source has been working great. For the last two weeks I’ve been trying to build a radio from it that uses time conditions within the script to determine the set of playlists to choose from. Getting these conditions to work has been driving me nuts. I’m still trying but it looks like I’m going to have to ask for help with that one too.