I return with more info! I seem to have been able to pin point the error this time. It happens when I mouse over my raid leader. Either on the raid frames or just over his models, however there are different errors depending on where I mouse over. When mousing over raid frames this occurs (
http://i.imgur.com/OfetRfG.png,
http://i.imgur.com/1QVvTH0.png) and when mousing over his model this occurs(
http://i.imgur.com/hiGr5lD.png,
http://i.imgur.com/FJpz3Tg.png). Additionally it seems like his class colour is white on the tool tip instead of red like it is for the other DK's in the raid, as can be seen here (
http://i.imgur.com/nItdnWX.jpg). Mousing over other players with assist, including myself in the raid did not create the error, nor did it appear when mousing over anyone or anything else!