I was banded 3/25 and I am having exactly the same issue. It is not gross, it is a fact of life. I have only been drinking everything. I have had Soup (clear mostly) Jamba juice Protein smoothie, and ice tea. I have not has a solid bowel movement since the surgery Tuesday. I think my husbands joke about my stomach was something to the affect: rumble in your tummbly. (Pooh and Tigger thing! We have kids.) I was told by my surgeon, Dr. John Marsden that it would occur and to not worry too much about it. However if I start on soft foods and it continues to let'm know.
I hope that helps you.