IF YOU ARE ALREADY STUCK: Find the tiny detention/release "button" in the grove at the back near the top of the base unit. Use a butter knife or the back of a sharp one to slide the button DOWN toward the counter (not in toward the blender blades).[br]
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TO PREVENT THE PROBLEM: Look at the 4 locking tabs on the single serve cup. They are rectangular with the lower right corner HEAVILY beveled (when viewed broadside). The solution to the problem is to LIGHTLY bevel the upper left corner too. I used a pocket knife to shave just a little bit off at 45 degrees. Proceed carefully one tab at a time testing it in the rear slot. Shave just enough to get an easy release. Shave all 4 tabs on the cup so it doesn't matter which one is inserted in the rear groove.