White spots are an occasional problem with glace icing, but I wasn't aware that RI would have the same issue. I've found that adding brite white food color really cuts down on problems with the finish of the icing. I hope someone with RI experience will jump in with a solution for you. (Your cookies are FABULOUS, by the way! I wish I could turn out gorgeous bouquets the way you can!)
could it be the fat from the cookie oozing up through the icing...?
Is is blotchy spots or discolored spots?
can you post a picture?
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