I know this feature is not officially supported, but thought I would report a possible problem in that the right-click context menu only appears to work if you have at least one other menu on the page set to 'alwaysvisible=1'. In other words, you can't have only a context menu without any other menus.
Yep. All the relevant sources etc. are in place. If I add a completely different menu that is visible, it all works fine. As soon as I take that away, the context menu doesn't work. In fact, I get no right click menu at all...including the default one.