OpenGL can only bind to GL_TEXTURE0 - c++

Question

I'm trying to bind multiple textures to my shader but when I use some other enum than GL_TEXTURE0 my shader shows unpredictable behaviour (e.g. all inout variables get zero).
This is how I bind the textures (in other projects this works prefectly)
glActiveTexture(GL_TEXTURE0);
sceneTex->bind();
glActiveTexture(GL_TEXTURE1);
depthTex->bind();
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
VBO->bind(GL_ARRAY_BUFFER);
unsigned int stride = 2 * sizeof(float) + 2 * sizeof(float);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, (void*)0);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void*)(2 * sizeof(float)));
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
VBO->unbind(GL_ARRAY_BUFFER);
glActiveTexture(GL_TEXTURE0);
sceneTex->unbind();
glActiveTexture(GL_TEXTURE1);
depthTex->unbind();
When I remove glActiveTexture(GL_TEXTURE1) everything works fine. When I remove glActiveTexture(GL_TEXTURE0) I still get the problem. The same problem occurs if I try to use GL_TEXTURE2 or some other enum.
This is my fragment shader:
#version 440
out vec4 fragColor;
layout(binding = 0) uniform sampler2D colorMap;
layout(binding = 1) uniform sampler2D depthMap;
in vec2 texUV;
void main()
{
fragColor = texture(colorMap, texUV) / 2.0 + texture(depthMap, texUV) / 2.0;
}
When I check the states with glGetIntegerv everything seems fine. But it isn't.

Answer 1

I finally found the error and I have to commit that I made a real beginner mistake. Hard to believe that no one found this error.
I thought that one call of glEnable(GL_TEXTURE_2D) would be enough for all texture slots but how i found it you have to call glEnable(GL_TEXTURE_2D) for every active texture you have. So the right code looks like this:
glActiveTexture(GL_TEXTURE0);
glEnable(GL_TEXTURE_2D);
sceneTex->bind();
glActiveTexture(GL_TEXTURE1);
glEnable(GL_TEXTURE_2D);
depthTex->bind();
// draw some stuff
glActiveTexture(GL_TEXTURE1);
glDisable(GL_TEXTURE_2D)
sceneTex->unbind();
glActiveTexture(GL_TEXTURE0);
glDisable(GL_TEXTURE_2D)
depthTex->unbind();