Could you post your pixel shader as well?

Sure thing, code is copy-pasted from online source (I wanted to postpone writing pixel shaders for a bit).
In the drawstring() method above I switch shader resources in a for-loop (e.g. 4 quads with letters, 1 with a number, 4 with letters). Only after the loop has finished do I call Draw(). I think this may be what I'm doing wrong - am I supposed to hold two textures in the pixelshader?

/*
    Beginning DirectX 11 Game Programming
    By Allen Sherrod and Wendy Jones
    Texture Mapping Shader
*/

Texture2D colorMap_ : register( t0 );
SamplerState colorSampler_ : register( s0 );

struct VS_Input
{
    float4 pos  : POSITION;
    float2 tex0 : TEXCOORD0;
};
struct PS_Input
{
    float4 pos  : SV_POSITION;
    float2 tex0 : TEXCOORD0;
};

PS_Input VS_Main( VS_Input vertex )
{
    PS_Input vsOut = ( PS_Input )0;
    vsOut.pos = vertex.pos;
    vsOut.tex0 = vertex.tex0;
    return vsOut;
}

float4 PS_Main( PS_Input frag ) : SV_TARGET
{
    return colorMap_.Sample( colorSampler_, frag.tex0 );
}

Could you post your pixel shader as well?

Sure thing, code is copy-pasted from online source (I wanted to postpone writing pixel shaders for a bit).
In the drawstring() method above I switch shader resources in a for-loop (e.g. 4 quads with letters, 1 with a number, 4 with letters). Only after the loop has finished do I call Draw(). I think this may be what I'm doing wrong - am I supposed to hold two textures in the pixelshader?

/*
    Beginning DirectX 11 Game Programming
    By Allen Sherrod and Wendy Jones
    Texture Mapping Shader
*/

Texture2D colorMap_ : register( t0 );
SamplerState colorSampler_ : register( s0 );

struct VS_Input
{
    float4 pos  : POSITION;
    float2 tex0 : TEXCOORD0;
};
struct PS_Input
{
    float4 pos  : SV_POSITION;
    float2 tex0 : TEXCOORD0;
};

PS_Input VS_Main( VS_Input vertex )
{
    PS_Input vsOut = ( PS_Input )0;
    vsOut.pos = vertex.pos;
    vsOut.tex0 = vertex.tex0;
    return vsOut;
}

float4 PS_Main( PS_Input frag ) : SV_TARGET
{
    return colorMap_.Sample( colorSampler_, frag.tex0 );
}

Could you post your pixel shader as well?

Sure thing, code is copy-pasted from online source since I'm still getting the hang of things so I wanted to postpone writing pixel shaders for a bit. Am I supposed to take the texture swtich into account in the pixel shader itself?

/*
    Beginning DirectX 11 Game Programming
    By Allen Sherrod and Wendy Jones
    Texture Mapping Shader
*/

Texture2D colorMap_ : register( t0 );
SamplerState colorSampler_ : register( s0 );

struct VS_Input
{
    float4 pos  : POSITION;
    float2 tex0 : TEXCOORD0;
};
struct PS_Input
{
    float4 pos  : SV_POSITION;
    float2 tex0 : TEXCOORD0;
};

PS_Input VS_Main( VS_Input vertex )
{
    PS_Input vsOut = ( PS_Input )0;
    vsOut.pos = vertex.pos;
    vsOut.tex0 = vertex.tex0;
    return vsOut;
}

float4 PS_Main( PS_Input frag ) : SV_TARGET
{
    return colorMap_.Sample( colorSampler_, frag.tex0 );
}