We had issues with bubbles forming in 4 of our cakes last weekend. They were not refrigerated or in any sort of temperature change. It is the first time this has ever happened and thank God none of them were wedding cakes. I even stripped the icing off of one, refrosted and it bubbled again. Any idea what caused this? Suggestions? Thanks!

If they were not refrigerated or in any sort of temperature change AFTER decorated, blowouts can still happen when air/gas is trying to escape from light and airy cake. The layers may have needed more time to settle.

Also, I don't know how your layers were stored BEFORE decorated, but if they were frozen, and iced before completely thawed, you can still experience blowouts from this as the air needs to expand/escape from somewhere in the icing. HTH.

the cakes may not have been settled long enough...air gets trapped between the layers and causes "ga bubbles" to form