Hi all,
This happened to me once before don't remember how to solve it.
I launch Composer 8.21, I enter my admin credentials and after in the Dock three spawns of Composer opens and quietly quits… pretty cool looking animation but lacking functionality ;)

I'm on 10.6.8 OS Mac Pro, all the latest and (greatest?) OS updates applied.
Dumping the Composer's plist doesn't do anything and it happens in every user account.
Thanks in advance!!
-P@