Yes, twice.
Once was dinner at Hollywood & Vine. (This was a long time ago - 2001, I think.) We had the dinner package with reserved seating for Fantasmic, and I barely made it through the show before having to find a restroom. The food itself was not good, not even dessert. None of us enjoyed the meal and did not eat much, but I was the only one who got sick. I ended up eating jello and crackers from the food court back in the room. Felt sick for most of the next day and have never had a desire to return.
The second time was a couple of years ago from dinner at Boma. My husband and I both got sick from that one, and I was up all night back and forth to the bathroom. I stayed in bed all day the next day and didn't start to feel better until that evening. I don't think the food was bad there, I think it was some kind of spice(s) that did not agree with the two of us. Our DD was fine. We have since gone back for breakfast and loved it - in fact, I think it is the best non-character breakfast on property. Just not too anxious to do dinner again!