[caszum]

I had the same issue. All I did was go into the nibRealUI.lua inside the WTF folder.

World of Warcraft\WTF\Account\YOURACCOUNTNAME\SavedVariables\nibRealUI.lua

This part should be near the top just look for the "char" field

Where it says

["char"] = {
		["Othercharacter- Otherrealm"] = {
			["init"] = {
				["installStage"] = -1,
				["needchatmoved"] = false,
				["initialized"] = true,
			},
		},
		["Character - Realm"] = {
			["init"] = {
				["installStage"] = -1,
				["needchatmoved"] = false,
				["initialized"] = true,
			},
		},
	},

change it to

["char"] = {},