Solution:
connect wireless display
start hwinfo
settings - disable the "Validate Window Positions" option
close hwinfo
Re-open hwinfo
Minimize hwinfo
close Hwinfo
disconnect wireless display
HwInfo now works as intended
Having the same issue. I used the sensor window on my laptop connected as a wireless display. Now I cannot get the sensor window back unless that "wireless display" is reconnected. I have reset everything... no go... still ONLY displays the sensor window when the wireless display is connected.