So i've uninstalled every CS6 app.
I've used Adobe cleaner tool, just in case...
Reinstalled Flash CS6 from Application Manager.
Updated Flash CS6 from Application manager...
Nothing is solved...
Where is Adobe's support???
It seems the problem is solved. I think it was a conflict with Fontcase.
I rebooted in safe mode, opened flash, it seemed to work better...
Opened flash, still giving problems. I notice in Activity Monitor that a fontd process is conusming 100%, and goes away when I close flash.
Uninstalled Fontcase by sending it to the trash.
Now Flash opens in less than 10 seconds. There's still a spinning wheel when "Initializing UI", but the software seems to work properly. No more lag in the mouse clicks.
Man what a night...
After reinstalling Mac OS 10.8.2, and reinstalling Adobe CS6, I finally figured out what was really causing the problem..
It is a software called Hiss, which translates Growl messages to Mac OS notifications.
I would have never thought that would be the problem... in fact after knowing what it was I could easily reproduce the error, and even found other people with the same problem.
Well that's it. I hope someone stumbles upon and simply uninstalls Hiss instead fo spending 2 days trying to solve it as I did.