It also happened for me without onboard or xprop, just by pressing alt-tab and then doing "something" that the switcher didn't like.
Attached is the output of xininfo -root -tree when this happened.
It also happened for me without onboard or xprop, just by pressing alt-tab and then doing "something" that the switcher didn't like.
Attached is the output of xininfo -root -tree when this happened.