I did 3 racks of ribs in my smoker last Wednesday. On Saturday, I did 3 more racks. The first set of ribs tasted great. I did the second batch of ribs with the same prep, same rub, same temp, same cook time, same wood (Mostly Cherry with some Hickory), but it had an OFF Flavor. The only difference is that I didn't foil this batch. The tray of beans that I put under the ribs for the last couple of hours ALSO had the same off flavor. I used my MES40 with cold smoker attachment. Am scared to use my smoker again.... Any ideas????