When launching in fullscreen or enabling in-game the screen turns black but plays sound and accepts input. This occurs only on the first of the two screens listed below and even if the other is physically disabled. I'd like to use fullscreen on this monitor because it's necessary for Nvidia 3D Vision. It worked approx. 3 months ago and no changes have been made by me since

Things I've tried:
Updated game with GOG Galaxy, verified files
Clean-installed latest NV drivers
Reset user.settings
Uninstalled GeForce Experience
Changed desktop resolution and refresh rate from 120 to 60Hz
Changed max fps in game and user.settings
Changed monitor in user.settings and in-game

ASUS VG248QE 1080p @ 120 Hz (issue)
BenQ XL2730 1440p @ 120 Hz (works at 1080p, 1440p, 120 and 60Hz)
gtx 1070 @ stock
i5 6600k