Any clue what might be causing this: http://postimg.org/image/cbng1hni5/

http://postimg.org/image/drnsnt91n/

Violet disappears when you get closer... Missing far mesh or something? How to determine this?

Looks to me maybe the texture is missing. Try using Refscope to see what mod it belongs to or if you prefer you can use the console to find out the form ID and go from there.