What steps will reproduce the problem?
1.  Use Icehud with DogTag enabled.
2.
3.

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

Lots of errors around the bars, untill turned off DogTag support.

Error from Bugsack:

        {
            ["message"] = "LibDogTag-3.0-90203.90203 Error with code \"[Level:DifficultyColor] [SmartRace:ClassColor] [SmartClass:ClassColor] [PvPIcon] [IsLeader ? \"Leader\":Yellow] [InCombat ? \"Combat\":Red] [Classification]\" (Base;Unit). IceHUD\\libs\\LibDogTag-3.0\\Compiler.lua:323 Division by zero",
            ["time"] = "2011/09/30 17:33:31",
            ["stack"] = "IceHUD-r859\\libs\\18LibDogTag-3.0-90203\\Compiler.lua:323 in function <IceHUD\\libs\\LibDogTag-3.0\\Compiler.lua:320\nIceHUD-r859\\libs\\18LibDogTag-3.0-90203\\Compiler.lua:735 in function <IceHUD\\libs\\LibDogTag-3.0\\Compiler.lua:684\nIceHUD-r859\\libs\\18LibDogTag-3.0-90203\\Compiler.lua:817 in function <IceHUD\\libs\\LibDogTag-3.0\\Compiler.lua:684\nIceHUD-r859\\libs\\18LibDogTag-3.0-90203\\Compiler.lua:1198 in function <IceHUD\\libs\\LibDogTag-3.0\\Compiler.lua:684\n(tail call): ?\n<in C code>\nIceHUD-r859\\libs\\18LibDogTag-3.0-90203\\Compiler.lua:2012 in function \"CreateFunctionFromCode\"\nIceHUD-r859\\libs\\18LibDogTag-3.0-90203\\Compiler.lua:111 in function <IceHUD\\libs\\LibDogTag-3.0\\Compiler.lua:104\nIceHUD-r859\\libs\\LibDogTag-3.0\\LibDogTag-3.0-90203.lua:395 in function \"AddFontString\"\nIceHUD-r859\\modules\\TargetInfo.lua:998 in function <IceHUD\\modules\\TargetInfo.lua:996\nIceHUD-r859\\modules\\TargetInfo.lua:1007 in function \"RegisterFontStrings\"\nIceHUD-r859\\modules\\TargetInfo.lua:210 in function \"Enable\"\nAceAddon-3.0\\AceAddon-3.0-11.lua:543 in function \"EnableAddon\"\nAce3-r1037\\AceAddon-3.0\\AceAddon-3.0-11.lua:636 in function <Ace3\\AceAddon-3.0\\AceAddon-3.0.lua:621\n<in C code>\nFrameXML\\UIParent.lua:271 in function \"UIParentLoadAddOn\"\nFrameXML\\UIParent.lua:345 in function \"TimeManager_LoadUI\"\nFrameXML\\UIParent.lua:593 in function <FrameXML\\UIParent.lua:568",
            ["session"] = 2,
            ["counter"] = 2,
        }, -- [4]