In my case : Ubuntu 12.10, Nvidia proprietary drivers, up to date, when I open a fullscreen app on the second monitor, Unity dock & top bar do disappear, but they re-appear as soon as I click on something on the primary monitor.
I partly worked around it by setting the dock to only appear on the primary monitor but the top bar is still here.
Hi ! It seems the bug is partly fixed.
In my case : Ubuntu 12.10, Nvidia proprietary drivers, up to date, when I open a fullscreen app on the second monitor, Unity dock & top bar do disappear, but they re-appear as soon as I click on something on the primary monitor.
I partly worked around it by setting the dock to only appear on the primary monitor but the top bar is still here.