Hi wifeofmars,
Did the doc by any chance take a stool culture along with your colonoscopy? If you have an infection like c.difficile, then the Prednisone would make it worse because it decreases inflammation but lowers your immunity. I had c.diff after a Crohn's flare a couple of years ago, and it took us a long time to figure it out and diagnose it. If the Pred and Lialda are not working, then maybe ask for a stool culture. BTW most of the treatments for Crohn's and UC are similar, so if there is anyway we can help here in Crohnnie land, feel free to ask