Why will Appigo Sync not start on Mac OS X?

Appigo Sync is a background process so it is going to act differently than other applications. When Appigo Sync is open it will not show up in the dock or be shown in the desktop. Rather, Appigo Sync's icon will show up in the top desktop menu bar.

By clicking on the Appigo Sync icon you can quit Appigo Sync or open Preferences.

In order to re-install Appigo Sync or update it, you will need to quit the program.