Cakebaker is absolutely right. I used to have all sorts of problems from not letting my cakes rest enough. I'll bet that if you let them rest for a few hours (minimum) you'll see a big difference. Also, make sure they are completely cool before you work with them. If they are even a just a little tiny bit warm when you stack them or start working with them you'll be sorry. A little warmth can really wreak havoc on a cake.
Good luck!!

Amanda
Now that I think about it, I'm pretty sure Cakebaker was the one that gave me the same advice and helped me out when I had issues with cracking icing and dowel rods poking out. Thanks, cakebaker!!!
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Good sound advice!