I thought this "feature" was going to be fixed in Windows 10 but to my surprise not only is not fixed now is moving some of the windows to any turned off monitor. If I turn on the monitor where it was moved and turn it off it moves the window to the other turned off monitor... and never to the main monitor... It's REALLY frustrating and annoying.
I have 3 monitors, but I'm not using all of them so I have to turn some of them off. And no, I'm not going to turn them all on before I turn on the computer as I read somewhere (viva la tecnologia!!)... ¬¬
In Windows 8.1 I noticed that this "feature" was only happening when I installed the amd driver from the amd website. But now it seems Windows 10 uses a new version that have it always activated by default plus it's **** up... (the driver... or the "super real useful indesactivable feature").
In Windows 10 is working really weird, sometimes keeps the window in the turned off monitor but sometimes moves the window to the main monitor and sometimes moves the window to a turned off monitor.
So +1 to this incredible feature that have more than 5 years? and it's working great!