When autohide is toggled on, the unity launcher won't show up unless I press the super key. This problem is present in Unity and Unity 2D. The launcher worked properly before but for some reason it isn't working as it should any longer.
closed as off topic by Takkat, Eliah Kagan, Mitch♦, LnxSlck, Tom Brossman Oct 2 '12 at 21:58
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It's most likely to do with the sensitivity of the reveal and has been a problem for many people since they took the autohide dodge feature out. The problem is worse on touchpads because the amount and speed of travel is less.
Finally, there appears to be a bug report that is being taken seriously: https://bugs.launchpad.net/unity/+bug/931982
There were bug reports previously but they were closed out after some minor adjustments were made. The adjustments didn't seem to make much difference.
Set the reveal sensitivity to maximum (system settings -> appearance -> behaviour tab) and if this doesn't work increase the speed of the mouse.
If it still doesn't work and you're on a touchpad try attaching a mouse set to a high speed and see if that works. (for testing, mainly)
You say you've changed things using Ubuntu tweak. I guess it's possible a setting has caused a conflict or had an unwanted action in this case. Try resetting Unity to all the defaults and see if the problem goes away:
Warning! This will undo all the changes you've made to unity - Launcher size, behaviour, colours, everything.