delivered reunion cake to party and when I took the full sheet cake out of the box the edible picture of the school started to crack...I tried to push it together and it was still noticible. It turned out awesome and can't believe it would happen. Used a new frosting and sent a note to the creator on Wilton to see if maybe it was too moist...I am sick, sick, sick. Don't know if I should offer part of her money back...this has never happened with any of my cakes. It is extremely hot here in Ohio but have air conditioning so that was not the problem...I don't think.
I have used plywood since about the second cake I ever did.. the cake boards just always felt too flimsy to me. It is not expensive either. I bought an entire sheet of plywood ( I can't recall exactly how much it was but I remember being surprised at how cheap it was and wished I had done it sooner) at Lowe's and they cut it for me into the different sizes I requested at no charge.. so I have several of each size that way if they do not get returned right away I am ok. I sanded the edges smooth and cover them with heavy duty silver wrapping paper, makes me feel so much safer when carrying the cakes.
Ditto, I would have to agree that it was your cake boards. Cake boards are just not sturdy enough. That was most likely the culprit. I had this happen to me before. I actually felt the cake board give, and it cracked my crusting buttercream icing. It made the cake look amateur, so I feel your pain. I would invest in the 1/4 inch plywood as suggested.
I actually glued 3 cardboards together. Went to Home Depot and had them cut a massonite board for me but found it too heavy to carry with it. Slid it into a sheetcake cardboard box for extra strength. I have never had this happen before so was baffled and sick. I just think I won't do sheet cakes anymore. Thanks ya'll.
plywood is 4X8 and comes in 1/4, 1/2, 3/4 etc- you can get T1-11 (more of a siding and rough cut), plywood, or OSB (oriated strand board) osb is cheaper, and works great, its as sturdy, you just cant get it wet- true ply is a little more durable- personally I would shellack or paint it- and still wrap it. 
I actually glued 3 cardboards together. Went to Home Depot and had them cut a massonite board for me but found it too heavy to carry with it. Slid it into a sheetcake cardboard box for extra strength. I have never had this happen before so was baffled and sick. I just think I won't do sheet cakes anymore. Thanks ya'll.
If the crack happened after the cake was moved around, then I would say it is the support under it. Don't give up on them, just figure out a better board for under it.
I bought several wooden cutting boards of various sizes at the Christmas Tree Shop and the dollar store. They have nice finished edges, and they weren't expensive.
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