Apple Qmaster: Sharing sometimes does not enable with custom shared cluster storage path

Sharing sometimes does not successfully start when you have set a custom shared cluster storage path. When you click Start Sharing in the Apple Qmaster System Preferences pane, the button dims and may not switch to Stop Sharing. If you quit System Preferences and reopen it, the Stop Sharing button may appear to be active, but the Quickcluster may not be available in Compressor.

This may happen if you set a path that contains spaces. For example,

/Volumes/Media/Sharedstorage

should work, but

/Volumes/Media/Shared storage

will not. Be sure there are no spaces anywhere in the path to your custom storage location.