Wrong pixel color detected on secondary monitor.

[idontevenseethecode]

Active Window Info and the PixelGetColor are both returning 0xFFFFFF as the color of any pixel on my secondary monitor. It works fine on my primary monitor (notebook). If I set my external monitor as the primary in Display Properties, the color is only reported accurately in a large rectangular area in the top left.

The problem only affects the color. Other control attributes are properly reported.

System Configuration:
Recent gaming notebook w/ external GPU (NVIDIA 1080 GTX)
4K monitor plugged in as secondary (but I can make it primary) in Extended Mode
Windows 10 Pro
Autohotkey_L 64-bit w/ UIA, v1.1.24.05 - February 3, 2017

[xZomBie]

Works as it should for me on my 2nd screen.

[idontevenseethecode]

Thanks for checking. I would appreciate if someone could point me in the right direction on how to debug this. Is the project open source; can I build it myself and poke around?