I'm using Suite 2009, I did change back to my old mouse and got back my ability to zoom & pan both with my scroll button. These problems did come about after changing my mouse. The old mouse's pointer drifts. However, a simple line, triangle sketch, can't be feature extruded without going through the doctor to coincidentally constrain all points. This used to be automatic, and when I would start a new line on another's endpoint, the endpoint would change color ( I believe to green), now it is grey and unconstrained. The arc capability through the line command does not respond at all as the endpoints remain unidentifiable.