"Always on Top" not always working?

The only problem I've had with TLB is that despite having it set to "Always on Top", it frequently won't come up when I bump the top of the screen. It seems to happen the most when I have Firefox running.

I have Auto Hide and Always on Top selected.
I've had this issue whether it's in Taskbar or Toolbar mode.
I have it docked to my main monitor at the top.
I am not using Full Row mode.

Is there a way to force it so that it will *always* appear over all other programs when I call it?

This is under 64 bit Windows 7.
TLB v4.4 (64 bit)

Thanks