Instruments and FX are not working , Help !

Hello friend recently i bought Max for Live! I Downloaded Max6 and follow the installation steps. A Month later Max asked permission , the trial period was over. But I never opened the stand alone application.
Then I started having some problems
Max instruments open but work ten minutes and don't works any more in the same project even i restarted the project. I Tried deleting Max 6 from the Applications folder and then i reinstall Max but this time the Max 5 just in case the problem was the license but doesn't work .
Max passes the authorization on Live but don't Works.

Someone could help me?

Thanks