i have a blackbook and the trackpad seems very unresponsive when scrolling. when using the mouse its good but when scrolling on web or document it becomes very unresponsive. it will work but i have to reposition my fingers to what seems like a magical spot on it to have it scroll correctly. any ideas? when i use my friends new blackbook or my friends pro its completely different, meaning it works fine. i hate to take it to the apple store since it works and its a kinda a judgment if its really not working right.