missing Healthrace bar

[Sloth]

I just updated to 5.03.06, and now the healthrace bar is gone. /nui hud healthrace doesn't work either.

And I get this, when I enter a vehicle, but I guess that's another story

Date: 2009-06-03 19:08:52
ID: 1
Error occured in: Global
Count: 10
Message: ..\AddOns\nUI\Bars\nUI_Button.lua line 310:
   GetSpellName(): Invalid spell slot
Debug:
   [C]: ?
   [C]: GetSpellName()
   nUI\Bars\nUI_Button.lua:310:
      nUI\Bars\nUI_Button.lua:278
   [C]: ActionButton_Update()
   ..\FrameXML\ActionButton.lua:149: ActionButton_UpdateAction()
   [string "*:OnAttributeChanged"]:1:
      [string "*:OnAttributeChanged"]:1
   [C]: SetAttribute()
   ..\FrameXML\RestrictedFrames.lua:522: SetAttribute()
   [string "			..."]:6:
      [string "			..."]:1
   (tail call): ?
   [C]: ?
   ..\FrameXML\RestrictedExecution.lua:825:
      ..\FrameXML\RestrictedExecution.lua:796
   (tail call): ?
   ..\FrameXML\SecureHandlers.lua:168:
      ..\FrameXML\SecureHandlers.lua:163
   [C]: SetAttribute()
   ..\FrameXML\SecureStateDriver.lua:100:
      ..\FrameXML\SecureStateDriver.lua:81
AddOns:
  Swatter, v3.1.13 (<%codename%>)
  ACP, v3.1.0.17 
  Babylonian, v5.1.DEV.130
  Badapples, v
  Bagnon, v1.7.1
  BagnonForever, v1.1.1
  BagnonTooltips, v
  Chronos, v2.12
  Configator, v5.1.DEV.130
  DBMBurningCrusade, v
  DBMCore, v
  DBMUlduar, v
  DebugLib, v5.1.DEV.130
  DrainSoulTimer, v2.1
  EnsidiaFails, v1.0
  Gatherer, v3.1.13
  GathererHUD, v3.1.13
  GathererDBWowhead, v1.0.2009-02-18
  Informant, v5.4.4157 (WallabyII)
  nUI, v5.03.06 (Dev)
  nUIIronLeather, v1.00.00
  Omen, v3.0.7
  Outfitter, v4.4.1
  QuestGuru, v1.0.8
  QuestGuruHistory, v1.0.5
  QuestGuruTracker, v1.2.1
  RatingBuster, v
  Recount, v
  Stubby, v5.4.4157 (WallabyII)
  TellMeWhen, v1.1
  (ck=2b2)