3D Only When One Monitor Attached

I'm trying to build a variant of our project that can use stereoscopic displays, screens to start with but VR later on, and whenever I try and launch our game on our 3D screen it wont detect that 3D is enabled until I disable the other monitors that are attached to the system. It's making development an utter pain!

I'm running on Windows 10 with a nvidia 980 connected to an LG 84LM960V. When I run a standalone build the "Stereo 3D" checkbox only appears when the 3D monitor is the only one connected.

If anyone has seen this before and knows of a fix I'd appreciate it, is anyone has seen this and doesn't it'd be great to know others share my pain at least!

TIA,
Keegan

 

Thought I'd bump this as still not found a way around it and it's most annoying!