I get this error when loading a daily guide or accepting quests. It only happens when I load a daily guide and goes away when I remove lightheaded. No issue exists when I load a leveling guide. Although I don't see a difference in code between the daily and the leveling for this section, something has to be triggering the error.

Message: Interface\AddOns\LightHeaded\LightHeaded.lua:290: attempt to compare number with string
Time: 01/15/11 08:40:09
Count: 1
Stack: Interface\AddOns\Auctionator\Auctionator.lua:386: in function <Interface\AddOns\Auctionator\Auctionator.lua:340>

Interface\AddOns\LightHeaded\LightHeaded.lua:290: in function GetQuestData' Interface\AddOns\LightHeaded\LightHeaded.lua:514: in functionGetQuestInfo'
Interface\AddOns\WoWPro\WoWPro_Mapping.lua:308: in function MapPoint' Interface\AddOns\WoWPro\WoWPro_Broker.lua:45: in functionLoadGuide'
...e\AddOns\WoWPro_Dailies\WoWPro_Dailies_GuideList.lua:65: in function <...e\AddOns\WoWPro_Dailies\WoWPro_Dailies_GuideList.lua:53>

It's because I have multiple QIDs allowed in the Daily guide. Thanks for catching this, I completely spaced that this would be a problem if you had Lightheaded enabled.

Resolved by ending the mapping function at that point if the QID is a string rather than a number.