Running El Capitan on a Mac Mini and latest version of iTunes (as of 21st Oct 2016). When I click iTunes icon it just "bounces" in the system tray. Eventually stops bouncing but iTunes does not open.
The Mac OSX Activity Monitor says the iTunes process is not running. No errors occur.
Have tried opening the system log while opening iTunes but no errors are reported.
Can only be fixed by restarting the Mac. This would be fine but my Mac Mini is my media server, so is a real pain to keep rebooting.