Name says it all. Taskbar is set to auto-hide, taskbar does not auto-hide, obviously I want it to auto-hide. Some program is keeping it from doing that. Sometimes I find the culprit quickly if the developer made something like the icon or app flash but sometimes I search for a while before I find it.
Bonus points if you know the windows message to trap to prevent a program from doing it because my next step is creating an open source app that blocks it and auto-generates an email to the developer every time it happens.
Edit: I'm presently looking at poking around with the SHAppBarMessage function when I get time so if anyone has already tried that, a success/fail report could save me time.