What steps will reproduce the problem?
1. open altoholic
2. click on char tab
3. change server from dropdown on left

What is the expected output? What do you see instead?
error popup

What version of the product are you using?
r93

Do you have an error log of what happened?
Message: Interface\AddOns\Altoholic\Altoholic.lua:148 bad argument #4 to 'format' (string expected, got nil)
Time: 10/15/10 20:22:06
Count: 1
Stack: [C]: in function `format'
Interface\AddOns\Altoholic\Altoholic.lua:148 in function `GetCurrentCharacterKey'
...erface\AddOns\Altoholic_Characters\TabCharacters.lua:161 in function `UpdateViewIcons'
...erface\AddOns\Altoholic_Characters\TabCharacters.lua:384 in function `func'
Interface\FrameXML\UIDropDownMenu.lua:636 in function `UIDropDownMenuButton_OnClick'
[string "*:OnClick"]:1: in function <[string "*:OnClick"]:1>

Locals: (*temporary) = "%s.%s.%s"
(*temporary) = "Default"
(*temporary) = "Der Rat von Dalaran"
(*temporary) = nil
(*temporary) = "string expected, got nil"

Please provide any additional information below.