Got a little problem.
I am learning blender and did the tutorial for the Rocket steam engine.
Model turned out fine, however, I did not do any texturing on the model while building it. Now, as I am trying my hand at texturing in blender, the models front wheel, that has no texture as of yet, appears to have what looks like rust growing on it as I render it. It started a little at the top of the wheel about the second time I rendered the image. The more I do and save the larger the area gets. Now, it has covered the entire front wheel all the way down the spokes to the hub. I checked the mesh, it is fine, it appears to be the material itself that has black smudge looking spots all over it.
Does this sound like a bug in Blender, or maybe a bug in my system?
Any input would be a big help
Thanks
I am learning blender and did the tutorial for the Rocket steam engine.
Model turned out fine, however, I did not do any texturing on the model while building it. Now, as I am trying my hand at texturing in blender, the models front wheel, that has no texture as of yet, appears to have what looks like rust growing on it as I render it. It started a little at the top of the wheel about the second time I rendered the image. The more I do and save the larger the area gets. Now, it has covered the entire front wheel all the way down the spokes to the hub. I checked the mesh, it is fine, it appears to be the material itself that has black smudge looking spots all over it.
Does this sound like a bug in Blender, or maybe a bug in my system?

Any input would be a big help
Thanks