My question for this post is, how do I track down these problem textures so that I can replace them with their originals or optionally a properly downsized texture. Then I thought 'maybe it is a normal map?' So I checked the normal maps and they look similar or equivalent to their originals. So I check both and find nothing obviously broken as all color maps opened just fine in GIMP and looked no different. So my first thought was 'hey I have a Spice of Life - Forts and aMidianBorn Imperial Forts, the texture issue should be there let's take a look.' In the screenshot, the texture appears on and in the imperial fort towers in Helgen for example. The problem is tracking down the corrupted/missing/affected textures. Second, I have all original textures from all of my mods backed up, so replacing the corrupted/missing/affected textures can be done fairly easily.
First off let me start off with this, I personally caused the issue in my screenshot by downsizing my textures via DDSopt.