Howdy,

I have a three monitor setup (Windows 8.1 preview DF 5.1.1b1), with an auto-hide DisplayFusion taskbar set against the right-side of the far-right monitor (and left-side of the far-left monitor). I have Firefox maximised on the right-side monitor, and a Steam Friends list aligned to the right-edge of the monitor behind it.

Occasionally (at least once a day, usually), DisplayFusion will enter a state where the right-side taskbar will no longer appear in front of Firefox or the Steam Friends list. If a window is attempting to gain my attention (orange button) the Start8 button will appear on top of the programs, but the rest will only display behind. Interestingly, in this state if the Firefox window is minimised then mousing over the Steam Friends list to the edge of the screen, in the manner that would normally un-hide the task bar, will cause the bar to appear for a second then disappear again - even though the mouse is on top of it.

Closing and reopening DisplayFusion does not correct the issue; closing and re-opening Firefox and Steam seems to.

(image and log attached, near the end before closing DF I moused over the bar a couple of times with and without windows on top).