Otherwise, you can quit searching for those mobs using the Search options window detailed below. If you see this message but still want to find the listed NPCs again, it's time to clear your cache by following the above procedure. It's completely safe because WoW will recreate your Cache folder after you log in again. Log in after you've done that and you'd be able to find Dirkee a second time. Note: Windows Vista and Windows 7 users see this info if your cache isn't in the location above. Thankfully, clearing your cache is a safe and simple matter. Instead, it checks your creature cache for the moment a rare mob is found. This addon doesn't use nameplates or mouseover units to find rares.
It has the same range as those targeting macros, but you won't have to mash any buttons.