[SOLVED] ReShade GUI issue in DX9 games

#include "ReShade.fxh"

/* BackBuffer size, default format */
texture2D texBufferSize1 { Width = BUFFER_WIDTH; Height = BUFFER_HEIGHT; };
texture2D texBufferSize2 { Width = BUFFER_WIDTH; Height = BUFFER_HEIGHT; };

/* Default size, default format */
texture2D texDefaultSize1;
texture2D texDefaultSize2;
texture2D texDefaultSize3;

float3 InvertColor_PS(float4 vpos : SV_Position, float2 texcoord : TexCoord) : SV_Target {
    return 1.0 - tex2D(ReShade::BackBuffer, texcoord).rgb;
}

void RenderOneTexture_PS(float4 vpos : SV_Position, float2 texcoord : TexCoord, out float3 color1 : SV_Target0) {
    color1 = tex2D(ReShade::BackBuffer, texcoord).rgb;
}

void RenderTwoTextures_PS(float4 vpos : SV_Position, float2 texcoord : TexCoord, out float3 color1 : SV_Target0, out float3 color2 : SV_Target1) {
    color1 = tex2D(ReShade::BackBuffer, texcoord).rgb;
    color2 = tex2D(ReShade::BackBuffer, texcoord).rgb;
}

void RenderThreeTextures_PS(float4 vpos : SV_Position, float2 texcoord : TexCoord, out float3 color1 : SV_Target0, out float3 color2 : SV_Target1, out float3 color3 : SV_Target2) {
    color1 = tex2D(ReShade::BackBuffer, texcoord).rgb;
    color2 = tex2D(ReShade::BackBuffer, texcoord).rgb;
    color3 = tex2D(ReShade::BackBuffer, texcoord).rgb;
}

/* Invert color, just to see that ReShade is doing something */
technique InvertColor {
    pass {
        VertexShader =  PostProcessVS;
        PixelShader =   InvertColor_PS;
    }
}
/* No issues */
technique RenderOneTextureAtBufferSize {
    pass {
        VertexShader =  PostProcessVS;
        PixelShader =   RenderOneTexture_PS;
        RenderTarget0 = texBufferSize1;
    }
}
/* No issues */
technique RenderTwoTexturesAtBufferSize {
    pass {
        VertexShader =  PostProcessVS;
        PixelShader =   RenderTwoTextures_PS;
        RenderTarget0 = texBufferSize1;
        RenderTarget1 = texBufferSize2;
    }
}
/* No issues */
technique RenderOneTextureAtDefaultSize {
    pass {
        VertexShader =  PostProcessVS;
        PixelShader =   RenderOneTexture_PS;
        RenderTarget0 = texDefaultSize1;
    }
}
/*
    If one of the following techniques is the last one executed,
    the ReShade overlay will disappear in DX9 games.
    The overlay reappears after deactivating this technique.
    Regardless, all other activated shaders still keep working.
*/
technique RenderTwoTexturesAtDefaultSize {
    pass {
        VertexShader =  PostProcessVS;
        PixelShader =   RenderTwoTextures_PS;
        RenderTarget0 = texDefaultSize1;
        RenderTarget1 = texDefaultSize2;
    }
}
technique RenderThreeTexturesAtDefaultSize {
    pass {
        VertexShader =  PostProcessVS;
        PixelShader =   RenderThreeTextures_PS;
        RenderTarget0 = texDefaultSize1;
        RenderTarget1 = texDefaultSize2;
        RenderTarget2 = texDefaultSize3;
    }
}