Seeing mobs : Vanguard Discussion

Ok when I first started VG my character could see mob tags though mountain, inside rooms, through rocks. This was really helpful after getting use to it since i could tell if we were going to get adds from behind something. Anyhow I thought this was VG form of tracking so I assumed this was part of the Bard class never played any other. Well I messed with the video card and now my sight is normal. Any suggestions on how to rebreak?