When you right click on an enemy that is invisible or stealthed(and you can't see them on your screen) the "inspect creature" option will show up, which allows you to easily pinpoint where the enemys are.
This trivializes enemy invisibility and stealth, and makes items/talents that offer see invisible/stealth far less usefull.
This bug has been around since I first started this game(B36) so I kinda assume it's already well known about. It really should be fixed before this game leaves beta.
Edit: Made the title actually descriptive of the bug
Invis enemy's can be found by right clicking on them.
Moderator: Moderator