open -a GrowlHelperApp worked for me.

Do you have both the old version and App Store versions installed?

Just had a stuck notification, and this worked well. Still got the "Unable to find application named 'Growl'" message, though, see comment above.

I get: "ps: Invalid process id: Growl".

But when I open Growl (via Alfred, from sys prefs, doesn't matter), I'm getting two windows. They both seem to be part of system preferences, but it looks there is two versions running side by side. Hmm.

Screenshot: http://i39.tinypic.com/21et...

The first time I run it in Terminal, I get: "Unable to find application named 'Growl'". If I run it again I get "No matching processes belonging to you were found" until I launch it again. Never does the menu bar icon disappear, but when I open the Growl prefPane (using Alfred) after either of these I get the "Welcome to Growl" window. So, it works?

(Haven't had a chance to test it on a "stuck" notification yet, but I do get those quite often)

Great!! works very well ;) ty

If the app doesn't need to be force quit, you could use something like: reopen() { osascript -e "quit app \"$*\"" -e "delay 0.5" -e "activate app \"$*\""; }.