I'm running Ubuntu 12.04 with a working auto-hide launcher bar, i.e., the touch to the left of the screen revealed the menu. It has stopped working perhaps the result of an automatic update. I have tried setting the sensitivity to no avail. I have turned off the auto-hide feature so that I have access to the bar.
Ubuntu – Menu launcher stopped working
autohideunity
Best Answer
It's related to the new Nvidia 304.51 drivers, it's a known bug with no fix at the moment, the only way to get the panel behaviour back is to revert to the previous driver release version.