Trash preferences and media cash and try again.
(holding shift+alt while starting Premiere).
btw which noise effect?
Do you mean deleting the preferences and media cache? I don't understand. And the effect is Video Effect - Noise & Grain - Noise. thanks
When Premiere is acting weird you can trash the preferences by holding shift+alt when starting up Premiere.
Then go to the Edit/Preferences/media and clean out Media Cache Database.