hmmm. i don't drag the handle bar(sometimes but rarely, in a different situation). i physically click inside the last anchor point which totally removes one handle bar so that the next section i draw can be any way i want it without changing the previous curve. this same thing applies to closing the shape at the original anchor point. it shouldn't changing the first curve that you drew. when you do this, as you mouse over the last point you drew you will get an upside down v next to the cursor. you will get a / next to it if you've already done this, clicked off the shape, and want to continue it. so basically, i draw my first point then my second and pull the curve, then click the cursor/pen inside that second anchor point and i do this every single time. i just can't trust illustrator to guess at my curves so i make every single one myself. this also allows you to go back with the open arrow or whatever it's called (the white one) ... grab any handle bar in your shape and adjust JUST that section of the over all shape without having any affect on any other sections. i'm sure you know this part but you should be getting an "o" next to your cursor when you close a shape.