Can I use Cream cheese frosting under fondant without it causing problems with the fondant? I'm a little fearful that I won't be able to get it smooth enough, but then I started wondering if the cream cheese frosting itself might make the fondant deteriorate.

Cream cheese frosting under fondant works fine but remember that if there is cream cheese frosting under the fondant, the cake should be refrigerated. I use a crusting cc so I can smooth with viva paper towel method.

Well it depends on the recipe. If you are using a crusting cream cheese buttercream there will be no problem. If you are using a regular cream cheese icing I would think it is to wet and would ruin the fondant. You could always do a cream cheese filling and cover in ganache then fondant then you get the best of all worlds! HTH

Oh fairmaiden I like that idea! Pattycakes, yes my CC frosting is a crusting recipe so I'll be good to go then unless I go with ganache instead.
Thanks ladies!

I've done it before, in the middle of July- for an outside birthday party too, and didn't have a problem with it. If you're worried about it not getting smooth enough, then just roll your fondant a little thicker. That way whatever is underneath won't show through. =)

It WAS a crusting cream cheese recipe.