Hey guys, Since yesterday I have a serious problem with my macbook air mid 2012, os x 10.10.1 The trackpad is unresponsive, but overactive. It just clicks where it likes to and moves around thereby highlighting things and moving stuff around. Additionally, a cable external mouse is affected as well. The left click does not work, sometimes scrolling fails and so on. I worked through this list: https://discussions.apple.com/thread/6686987 But nothing helped. Please, if anyone has an idea this would be so much appreciated! I am very frustrated and need the notebook for work. Cheers, Malte EDIT: I activated the option: ignore trackpad when mouse is connected in the accessibility preferences. The external mouse now works fine! Maybe this helps to tackle the problem.