No. A Color Shader has no folder input. I was just suggesting tests to see if there is an underlying bug present. The Color Shader would use the same random effector set to “Effector Color” to randomize the colors of the tiles.
Did you get the same issue when trying different texture folders, including ones with different types of textures (jpg, png, i.e.)?
It would help if you could upload your project file so that I, and possibly others, could try it with our own textures. Or at least a simplified version that shows the same issue.