I havent seen any issues with DK's but I did get the following errors upon auto census+ run ending:
Date: 2008-11-13 09:59:04
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\CensusPlus\CensusPlus.lua line 2017:
attempt to perform arithmetic on field '?' (a nil value)
Debug:
(tail call): ?
[C]: ?
CensusPlus\CensusPlus.lua

CensusPlus_DoTimeCounts()
CensusPlus\CensusPlus.lua

CensusPlus_OnUpdate()
CensusPlus\CensusButton.lua:61: CensusButton_OnUpdate()
[string "*:OnUpdate"]:1:
[string "*:OnUpdate"]:1
AddOns:
nLog, v5.1.DEV.130
Swatter, v5.1.DEV.150
WowheadLooter, v30014
Ace2, v
Ace3, v
AckisRecipeList, vBeta 9 @project-revision@
AlphaMap, v3.33.30000
AlphaMapBattlegrounds, v
AlphaMapExteriors, v
AlphaMapInstances, v
AlphaMapWorldBosses, v
AlphaQuestHelper, v1.01.30000
AtlasLoot, v5.01.04
AucAdvanced, v5.1.DEV.2530
AucDb, v5.1.DEV.3583
AucFilterBasic, v5.1.DEV.3767
AucFilterOutlier, v5.1.DEV.3747
AucMatchUndercut, v5.1.DEV.2531
AucScanData, v5.1.DEV.3767
AucStatClassic, v5.1.DEV.3767
AucStatDebug, v5.1.DEV.3811
AucStatHistogram, v5.1.DEV.3811
AucStatiLevel, v<version> (<codename>)
AucStatPurchased, v5.1.DEV.3767
AucStatSales, v5.1.DEV.2842
AucStatSimple, v5.1.DEV.3795
AucStatStdDev, v5.1.DEV.3781
AucStatWOWEcon, v5.1.DEV.2530
AucUtilAHWindowControl, v5.1.DEV.3311
AucUtilAppraiser, v5.1.DEV.2530
AucUtilAskPrice, v5.1.DEV.3175
AucUtilAutoMagic, v5.1.DEV.3142
AucUtilCompactUI, v5.1.DEV.2530
AucUtilEasyBuyout, v5.1.DEV.3583
AucUtilItemSuggest, v5.1.DEV.3108
AucUtilPriceLevel, v5.1.DEV.2545
AucUtilScanButton, v5.1.DEV.2530
AucUtilScanFinish, v5.1.DEV.2530
AucUtilScanProgress, v5.1.DEV.2530
AucUtilSearchUI, v5.1.DEV.3655
AucUtilSimpleAuction, v<version> (<codename>)
AucUtilVendMarkup, v5.1.DEV.2530
Automaton, v1.3.5
Babylonian, v5.1.DEV.130
Bartender4, v4.1.2
BeanCounter, v5.1.DEV.3583
BetterItemCount, v1.1
BetterKeyBinding, v
CastTime, v
CensusPlus, v4.1.10
ChatScroll, v3.0
ChatTimeStamps, v
Chronos, v2.12
Configator, v5.1.DEV.160
Constructor, v<version> (<codename>)
CurseProfiler, v
DebugLib, v5.1.DEV.130
Deformat, v1.0 $Revision: 3817 $
DevTools, v
DewdropLib, v
EasyDestroy, v
Enchantrix, v5.1.DEV.3744
EnchantrixBarker, v5.1.DEV.3576
EnhancedFlightMap, v2.0.9
EquipCompare, v2.13
FeatureFrame, v
FireTree, v
FishingBuddy, v0.9.6e
FluidFrames, v2.1
FuBar, v
FuBarBagFu, vv1.1.1
FuBarClockFu, v3.0
FuBarDurabilityFu, v2.0
FuBarEpicCountFu, v
FuBarExperienceFu, v1.1 $Revision: 65606 $
FuBarFactionsFu, v2.2.1-79
FuBarFriendsFu, v2.4.1-91
FuBarGuildFu, v2.4.1-98
FuBarLocationFu, v3.0
FuBarMailFu, v2.0
FuBarMoneyFu, vv1.2
FuBarPerformanceFu, v2.0.0
FuBarProfessionsFu, v3.0.1
FuBarSpeedFu, v2.0.$Revision: 48 $
FuTextures, v2.0
Gatherer, v<version>
GathererDBWowhead, v1.0.%date%
Historian, v1.2.6
Informant, v5.1.DEV.3721
Khaos, v2.4.1
LibAboutPanel, v1.111
LibBabbleBoss30, v
LibBabbleClass30, v
LibBabbleFaction30, v
LibBabbleInventory30, v
LibBabbleTalentTree30, v
LibBabbleZone30, v
LibExtraTip, v1.0
LibJostle30, v
LibRock10, v
LibRockConfig10, v
LibRockDB10, v
LibRockEvent10, v
LibRockHook10, v
LibRockLocale10, v
LibRockTimer10, v
LibSharedMedia30, v3.0-@project-revision@
LibTourist30, v
LibWho20, v2.0.@project-revision@
MobInfo2, v3.71
MonkeyBuddy, v
MonkeyLibrary, v
MonkeyQuest, v
MonkeyQuestLog, v
MozzFullWorldMap, v3.34.30000
OneBag3, v3.0.1-beta
Portfolio, v0.5
QuestHelper, v0.66
QuestHistory, v
ReagentID, v3.0.2PRE
RecipeBook, v
Sea, v1.39
SilverDragon, v1.0
simpleMinimap, v30000-3
Skillet, v
SlideBar, v5.1.DEV.136
Stubby, v5.1.DEV.130
TabletLib, v
Thottbot, v
TidyMinimap, v0.4
TipHelper, v<version> (<codename>)
TomTom, v176
TownGuard, v2.1.2
TweakHub, v2.0
WIM, v3.0.4
(ck=d49)
When it popped up, the end sound played, and then every few seconds would play again until I opened census+ and clicked stop