Material Preview & Blueprint model preview in bright green

Not sure why, but in my blueprints under viewport, I cant see the model because its illuminated in bright green. This happens with all my materials too, I can preview material changes because I have this bright illuminating green going on, any ideas would be great thanks

Oh Using macbookPro with MacOS High Sierra and 4.17.2 version of unreal. havnt had this issue in the past.