QuickTime and iTunes video playing fullscreen on external monitor automatic

Hello, on my Toshiba laptop with nVidia video card, I have an external monitor hooked up to the laptop. Every time I go to play video from QuickTime or iTunes, it plays the video at full screen size on the external monitor while also playing in the normal small window of QuickTime or iTunes on the main (laptop) LCD. I don't have the QuickTime Pro key installed on this machine, nor have I somehow selected to play videos at full screen. It does this whether I want to do it or not, which is quite annoying as the full screen version is usually flickering to boot.
Help please. I've looked in the QuickTime Control Panel and don't see anything that would cause this problem, nor in iTunes.
Cheers, Andrew.

A couple of things you might want to try. Open the QT Player settings, not to be confused with the QT Control panel. There should be settings in there for monitors and dual monitors I believe.
For the flickering, open the Display control panel>Settings>Advanced>Monitor. Listed under Monitor settings-Screen refresh rate: try changing the setting to 85 Hertz.

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