It sounds to me like the sugar may have crystalized. If so, it's completely harrmless and heating it in a water bath will dissolve the crystals. This happens frequently with products such as maple syrup and honey.
However, I agree that contacting the company is a good idea and I fully subscribe to the philosophy "when in doubt, throw it out".
"I’m going to break one of the rules of the trade here. I’m going to tell you some of the secrets of improvisation. Just remember — it’s always a good idea to follow the directions exactly the first time you try a recipe. But from then on, you’re on your own." - James Beard