It doesn't affect everyone. If it did, I suspect this thread would be ten times as big by now.
With any luck, you might be one of the many who are not affected.
I have the problem on my setup.
I have steam install and I have verified the files are all good.
Deferred shading was and is on.
Error that stops the fun is reported as:
2018-04-25 23:54:58.838 INFO RENDERER: Compile shader metashaders/terrain/varyhouselod.fx|metashaders/transformmodifiers/transform_vertinstanser.meta.hlsl|CLIPMAP_NORMAL_MAP=;CLIPMAP_SHADOW_MAP=;COLORCLIPMAP_ALPHA_IS_AO=;COLOR_CLIPMAP=;DIRECTX11=true;LAKE_COLORCLIPMAP=;NOISE_OP=PhotoshopOverlay;PBR_TEXTURES=;SPLATMAP=;STRUCTURED_INPUT=;SURFACE5=;TAD_CLIPMAP=;USE_DCS_DEFERRED=1;USE_TERRAIN_PALETTE=|
2018-04-25 23:54:58.850 ERROR RENDERER: Failed to build metashader: metashaders/terrain/varyhouselod.fx|metashaders/transformmodifiers/transform_vertinstanser.meta.hlsl|CLIPMAP_NORMAL_MAP=;CLIPMAP_SHADOW_MAP=;COLORCLIPMAP_ALPHA_IS_AO=;COLOR_CLIPMAP=;DIRECTX11=true;LAKE_COLORCLIPMAP=;NOISE_OP=PhotoshopOverlay;PBR_TEXTURES=;SPLATMAP=;STRUCTURED_INPUT=;SURFACE5=;TAD_CLIPMAP=;USE_DCS_DEFERRED=1;USE_TERRAIN_PALETTE=|
Reason: MetaShader compile failed: metashaders/terrain/varyhouselod.fx|metashaders/transformmodifiers/transform_vertinstanser.meta.hlsl|CLIPMAP_NORMAL_MAP=;CLIPMAP_SHADOW_MAP=;COLORCLIPMAP_ALPHA_IS_AO=;COLOR_CLIPMAP=;DIRECTX11=true;LAKE_COLORCLIPMAP=;NOISE_OP=PhotoshopOverlay;PBR_TEXTURES=;SPLATMAP=;STRUCTURED_INPUT=;SURFACE5=;TAD_CLIPMAP=;USE_DCS_DEFERRED=1;USE_TERRAIN_PALETTE=|Shader "metashaders/terrain/varyhouselod.fx|metashaders/transformmodifiers/transform_vertinstanser.meta.hlsl|CLIPMAP_NORMAL_MAP=;CLIPMAP_SHADOW_MAP=;COLORCLIPMAP_ALPHA_IS_AO=;COLOR_CLIPMAP=;DIRECTX11=true;LAKE_COLORCLIPMAP=;NOISE_OP=PhotoshopOverlay;PBR_TEXTURES=;SPLATMAP=;STRUCTURED_INPUT=;SURFACE5=;TAD_CLIPMAP=;USE_DCS_DEFERRED=1;USE_TERRAIN_PALETTE=|" failed to compile. Reason:
warning X4717: Effects deprecated for D3DCompiler_47
C:\\Program Files (x86)\\Steam\\steamapps\\common\\DCSWorld\\Bazar/shaders/metashaders/terrain/varyhouselod.fx(392,19-92): warning X3206: 'HackAlbedoWhenSunIsCloseToZenithAngle': implicit truncation of vector type
C:\\Program Files (x86)\\Steam\\steamapps\\common\\DCSWorld\\Bazar/shaders/metashaders/terrain/varyhouselod.fx(459,21-98): warning X3206: 'Sample': implicit truncation of vector type
C:\\Program Files (x86)\\Steam\\steamapps\\common\\DCSWorld\\Bazar/shaders/metashaders/terrain/varyhouselod.fx(460,25-111): warning X3206: 'SampleBias': implicit truncation of vector type
./Bazar/shaders/metashaders/shadingModels/shadingModel_MapTex.decomposed.meta.hlsl(12,6-12): error X3000: unrecognized identifier 'Program'