I am using Ubuntu 12.04 with default Unity. After last package update yesterday, the middle button of my three button mouse simply stopped working.
After the last time my Ubuntu 10.04 installed updates, my mouse middle button stopped working. The mouse is Toshiba and has three buttons (the middle one below the wheel). I activated the emulation in the meanwhile, but I prefer to keep using the button. I really don't know what update ruined it.