I've got an odd situation on arch linux with kdemod 4.2. I have two panels, bot set to auto-hide, but only one of them will actually hide itself. The other needs me to press the settings button at the end and then click anywhere on the rest of the screen. The panel then hides until my mouse touches the bottom of the screen, when it pops up again.

anyone?

I just tried this with two panels on the top and bottom of my screen set to auto hide. Both panels behave as I would expect, sorry.

Can you reproduce this from a clean configuration? (E.g. log in with a new user, add a panel to the top and set both to autohide).