Texture painting problem

Hi Blenderers ! I’ve recently faced an unknown problem: I was painting a mesh (Blender RC 2.74) with texture painting mode (far from being the first time) for the game engine, it worked well during the first 15 minutes and then everything went wrong, textures selected in texture paint mode have been replaced by simple colors !!! Textures already applied on mesh still look normal but I can’t paint with another thing that plain colors, whatever the texture I choose !!! :mad:
I checked every little parameter but everything looks OK and I don’t know what to do now…

No forget it I’ve found that my image was set with a scale of 0 everywhere ! Sorry :no: