As I mentioned, I refrigerate fondant cakes all the time. Having said that, at different times of the year if it is very humid, there will be condensation appear on the cake when it comes out of the fridge. But left alone and not touched, the condensation will evaporate while the cake sits at room temperature. As has been discussed in other threads in the forums, if you put your cake in a box and wrap it with saran, when you bring the cake out of the fridge, the condensation doesn't hit the cake...the box will absorb it.
If you read the following thread Blakescakes explains it a lot better than I can.
http://cakecentral.com/cake-decorating-ftopict-721168.html
As a matter of fact there have been discussions in the forums about freezing a completely fondanted and decorated cake and it being perfect when it is brought back to room temperature properly. The following thread is very informative and interesting! Again, look at Blakescakes post in this thread...
http://cakecentral.com/cake-decorating-ftopict-732338.html
Good luck with your cake...
