My guess is that it is one of the ingredients in the ice cream that caused this. By chance was there sorbital or another fake sugar, and what was the fake fat additive? I have on ocassions had this same experience with ice cream and only with ice cream. I am not lactose intolerant. I believe some formulations have an ingredient that causes me to have diarrhea. Unfortnately the times I have experienced this phenomena have been with ice cream purchased out and there is no way to know the ingredients. Read the label and see if you come up with anything.
Thanks for all your replies. I was out to get the ice cream....not sure why I just did not get the fatty kind. I figured it was soemthing in the ice cream. It finally slwed down about 3 am. I changed everything and it was thicker this am. Thanks again for all your help.