Were you having a problem with KOTJ? ParserLib-3.0 was written with ParserLib-1.0 included and designed to use ParselLib-1.0 when called for in an addon. I guess if beerke desires to change it he can test your code changes and implement them but it's not really required at this point.
Yes, when I revert back to the version without my change I get this error. Although it looks like you're right about Parser-3.0 being backwards compatible, making the .toc change alone seems to be sufficient to fix the error.
Date: 2007-06-30 05:46:38 ID: 16 Error occured in: Global Count: 1 Message: ..\AddOns\KingOfTheJungle\KingOfTheJungle.lua line 9: attempt to index global 'ParserLib' (a nil value) Debug: [C]: ? KingOfTheJungle\KingOfTheJungle.lua:9: in main chunk AddOns: Clique FuBarExperienceFu, v1.1 $Revision: 40915 $ FuBarFriendsFu, v2.4 FuBarMoneyFu, v20000-1 FuBarQuestsFu, v2.0 FuBarToFu, v2.0 FuBar, v33424 Gatherer, v2.99.0.0561 KingOfTheJungle AbacusLib Ace2 BabbleClass22, v2.2.$Revision: 36189 $ BabbleSpell22, v2.2.$Revision: 36189 $ BabbleZone22, v2.2.$Revision: 36189 $ Babble22, v2.2.$Revision: 40818 $ CompostLib CrayonLib Deformat, v1.0 $Revision: 3817 $ DewdropLib FuBarPlugin20, v2.0 $Revision: 36809 $ GratuityLib, vr$Revision: 41183 $ JostleLib PeriodicTable30, v3.0 Quixote RosterLib, v2.1 TabletLib TouristLib Swatter, v4.0.2