Purchased a weeek ago, at J.C.Penney. Used 4 times and now cannot get the glass off the base (it is full of smoothie) Called Pennys and was told I would need the box it came in to return it! Does everyone keep original containers after appliance appears to be OK? Talked to supervisor and was told they would make exception. I explained the glass was full and I could not return for 4or5 days. Does not matter-I need to bring in-full glass and all!! This is similar to Magic Bullet. Anyone else has problems?