Yes, I did.
The problem is that now finder seems not to show this app as running.
It's not in the list of "Force Quit" and so I can't select the options on the menu such as "Preferences".
If I want to quit the app I have to do via terminal with kill.
I restore the plist file as the original, I logged out, restart etc etc, but it doesn't work.
Is there a "cache" or something like that about apps and windows visualization on finder?