I and a WMI and two of my students (husband and wife). Have taken all III courses and on the last day of course III they came to me and showed me that the lily nail flowers we had made in class had cracked and sunk in the middle. The poinsettia did not but the rest of the flowers did. I have never seen this happen before but told them I would try to find out what went wrong. The only thing I can figure is it must have been the icing but the consistency was fine in class. Any suggestions????? I'm clueless. Thanks

Could there have been a bit of grease? Not enough to affect it right away, but later. Or is humidity a problem right now. If left out I've found that humidity can make RI a bit soft.