Hi there, Nancy! While not being refrigerated for a few days shouldn't cause your yeast to go bad, we'd definitely suggest testing your yeast to see if it is still viable. Just dissolve 1/2 teaspoon sugar in 1/2 cup warm water and then stir in a 2 teaspoons of the yeast. Let this mixture sit for about 10 to 15 minutes — it should become bubbly and expand. Yeast that is no longer viable shouldn't have given your rolls an offputting taste though. We wonder if another ingredient had spoiled? Without more details about ingredients or the process used, it can be hard to say. We'd suggest giving our friendly Baker's Hotline folks a call at 855-371-BAKE (2253), so we can help you troubleshoot this. Kindly, Morgan@KAF

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