how do you check your texture?
because if you do it on a model: are you sure the model has UV data? cause the error you describe is the common error that happens when an object without UV data (-> all UV 0,0 -> all colored with pixel top left of texture) is textured.
because if you do it on a model: are you sure the model has UV data? cause the error you describe is the common error that happens when an object without UV data (-> all UV 0,0 -> all colored with pixel top left of texture) is textured.