I've heard the same thing. To scry, you use the spell. The subject gets a Will save. If he suceeds, he can't be scried again for 24 hours.
Something like that. This is one of the few changes I really like. I always thought the Scry skill was a colossal waste of skill points, but I always felt obligated to put some in there for my Wizards for some inexplicable reason.