Can confirm that this happens on Windows 10 Pro 64-Bit, AMD APU graphics, 2 displays.
EDIT: I am using the "Minecraft Installer" with the Java version (I guess 8) provided by it.
Confirmed for version 1.6.5. (I am bugged by this because I normally have over 10 programs open and it fills up my taskbar.)
Jared Bates
Can confirm that this happens on Windows 10 Pro 64-Bit, AMD APU graphics, 2 displays.
EDIT: I am using the "Minecraft Installer" with the Java version (I guess 8) provided by it.