Okay, I checked out a few threads on my cat forum for you- there were 4 pages of just thread titles for this when I did a search- LOL! The ones I read said (for the most part, and I'll just give you the food switch answers

) that switching to a beef food made it worse, that adding a little plain yogurt would help (don't get the stuff with artificial sweetener), and several said it took a month for their cats to totally adjust to the new food and quit stinkin' up the place. Hope that helps!
I put the cat forum up here a while ago about finding a cat food- here it is again, if you'd like to do your own search-
www.thecatsite.com ;) .
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Andee, mom of Mattie, a 4 yr old, 4 girl cats, a turtle, assorted fish and wife of 1 patient husband