Same problem. It comes up in a variety of scenarios when Explorer needs to recalculate the layout for the Taskbar.
In Settings toggle the setting for "show application icons on the taskbar where the window is"
Coming out of sleep
Probably others
For now I've created a custom C# app that finds the sensor panel window every 5 seconds using win32 api and sets the window to top most. Working on a better solution to detect when the sensor panel is no longer top most and sets it. It's still messy, but I'm so tired of looking over at it and the taskbar is covering the bottom. Mine is on a 12" LCD with 1920x515 res, and the panel is supposed to take up the entire screen.
I'm also going to explore hiding the taskbar on that screen altogether.