Basically any shader I set for bgfx_screen_chains, e.g. xbr-hybrid or hq4x, etc, all just display a garbled image. Ranging from slightly fuzzy text (or entire screen) to the entire screen just being coloured squares.
Here are a few examples of said shaders when loading up 1944 - http://imgur.com/a/Xu1w1
The same shaders work fine in RetroArch and PPSSPP so it shouldn't be hardware related. For reference, the GPU in use is a Nvidia GTX 1060 on driver 381.22.