Can Meringue Powder go bad? I made my usual bc and something was off. Any help would be appreciated.

Ihave never had meringue powder go bad but your butter or crisco can both go rancid. The butter can pick up flavors from the refrigerator.

I was also having a problem with my icing, (that I've made for 26 years) only to find out on CC that the trans fat has been removed from the Crisco. I use the Wilton snow white buttercream icing recipe, I went to their site and found their recipe now contains corn syrup to allow for the change in the Crisco. Might be your problem.