I am experiencing hairline cracks in my wedding cakes after they have been sitting for a day or so decorated. It happens when I pick up the cake to carry it. I have been doing this for over twenty years and have never had a problem until last year. I fill the cakes with two layers of filling, and use the same frosting recipes. I have always used the silver , corrugated dummy bases. Could it be the shortening or butter I am using?

Has your weather been dryer this year?

It sounds to me like the cake board is too thin. Are you sure the ones you have been using,through the years, haven't changed and become not as strong?
Hope you can figure out the problem. Good Luck!

It's almost certainly your board!!! Cakes that crack when moved are not supported by a strong enough base. Perhaps the drums you're using have declined in quality??? For cakes over two tiers I use a double layer of 1/2 inch foam core--I glue the two boards together and cover with white fancy foil. Some people like particle board or plywood.

Thanks everyone. Found out that we have been getting generous with the filling and not enough structure of cake. We are now using less filling and No Cracks!