Flash Player working on guest user account NOT on main account

[tiddles75]

Please help me.

I downloaded Lion last Wednesday. Everything was ok... until yesterday.
Flash Player is not working anymore on Safari, Chrome or Firefox.

I uninstalled Flash Player then installed again but nothing.

I can't watch youtube and even on testmycam.com


BUT, it's still workings on a guest user account or an administrator account.

Can someone please help me?

I've been searching on the internet for 24 hours.

Thank you.