Cannot get LMS to startup at boot up

I have install LMS v7.8.0 and have set the server to automatically start at boot up, but it fails to do so. This wasn't any different using v7.7.X. I am running my Squeezebox classic and LMS on a Mac. Are there any other settings that I need to check to allow LMS to start automatically? There is only one user account on the Mac, so I have made the changes to LMS as an administrator, (given that other threads on this subject seem to focus on this).
Thanks
Chris