Using a brand new MBA with wireless KB and mouse and all of a sudden the mouse goes wonky. It will track but won't register a click most times. And when it did, it would sometimes register a right click. The trackpad would track and click but the click would never register. The KB was fine.
I did a quick search and found that the issue was Bluetooth. Maybe something in my mouse that was permanently clicking it, so I changed to another mouse and same issue. Reset SMU and same issue.
I finally disabled BT and the trackpad started clicking again and I deleted the BT mouse prefs and re-added the mouse and it started working again also.
Just a prefs issue, but what dumbfounded me was how the Bluetooth mouse affected the trackpad (non-BT) from working properly also. Maybe this post will get moved...