Why did Curse start ignoring the addon Carbonite? I can't find it on the Curse site and the Curse Client doesn't recognize the addon in the WoW addon folder. Though I don't care as much, It also refuses to recognize the ZHunterMod. I downloaded both of these mods via the Curse Client.

This is totally up the author of any addon where they want their addon hosted.   The authors of Carbonite removed their addon from Curse and are only hosting it on wowinterface. ZHunterMod is hosted on Curse.