I've still been having this issue with AnKor's shaders, and while it's worst in the UI animation screen, I've also seen the shadow crawls on aircraft in the game. Restarting the game clears it up sometimes. At other times it's fine until I restart the game, and then it gets messed up, so there's something apparently random about it. This happens in a variety of different installs.
Today I tried setting
<DisableTerrainLighting val="y"/>
<DisableSceneryLighting val="y"/>
and
<ZBiasShadow val="16"/>
It seemed better, but then I had it happen in the ETO UI screen again, so I don't think I've found the right setting that controls this yet.