Hi, I downloaded the demo version, set it up fine, got it syncing and everything, quit it, re-launched it, and the icon appears in the dock with the dot underneath it, but the main window is not visible, that is, I can't see the app!

If i click on the the dock icon the menu bar changes to show all the Omnifocus menus, and I can view the inspector, but no main window.

Any ideas how to correct this?

Try File>New_Window
(Apple-N)