I was trying to keep my icing from cracking so I added a little vinegar like someone on here said. It's TERRIBLE 
(My 7yo said it tasted like pickles 
) So I added more flavoring, but it still tastes 'OFF'
What am i missing??
I don't put vinegar in my icing. I use half butter, half shortening and thin with whipping cream. I make my icing a medium to slightly thinner consistancy and use the Viva method to smooth and never have problems with cracking. I used to have a lot of trouble with it, but think the thinner consistancy helps, plus the smoothing with the papertowel.
Hope this helps.
Cindy
Could your icing be cracking because your board underneath isn't strong enough? I used to have that problem. The cake would look fine until I moved it, and then a few minutes later I'd notice little cracks that got more pronounced as time went on! I always use foamcore boards now... Sorry I can't help more, I've never tried the vinegar either....
seems like that would make it bitter no matter what. 
HHHHMMMMMM, I would make sure your cake boards are strong enough and also what icing recipe are you using if I may ask?
I had this same problem and also heard of adding a couple drops of vinegar but haven't tried. I do think it's the board not being strong enough because it didn't crack until I picked the cake up and moved it.
I use to have problems with my icing cracking despite using double and triple cake boards. I read on CC to add a couple of drops of vinegar to prevent cracking. Ever since I read that tip and started using it, I have not had any more cracking issues what-so-ever. How much vinegar did you add? You should not taste the vinegar when adding it to a full batch (my full batch uses 2 pounds of powdered sugar) of frosting.
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