What steps will reproduce the problem?
1. Hitting reset on the advanced config frame
2.
3.
(Please provide as exact of steps as you can the better
the steps you give the easier I'll be able to reproduce
the problem and the faster it will be fixed)

Because the categories and bag bars aren't set up the way I would like I have been working to figure out a different setup that will allow me to more efficiently handle inventory.  And because I'm not certain how things work or what will work, this is a process of trial and error.  The ability to reset is a must.  Unfortunately, an error is the result of using reset.

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

I expect everything to reset to original config.  Not what I get.  Error.

What version of the product are you using?

The latest.  I have Curse premium.

Do you have an error log of what happened?

Date: 2014-07-11 10:13:12
ID: 8
Error occured in: Global
Count: 1
Message: [string "TInv_OptsFrame_Button_Reset:OnClick"] line 2:
   attempt to call global 'TInv_init' (a nil value)
Debug:
   [string "*:OnClick"]:2:
      [string "*:OnClick"]:1
Locals:
self = TInv_OptsFrame_Button_Reset {
 0 = <userdata>
 Right = <unnamed> {
 }
 Left = <unnamed> {
 }
 Middle = <unnamed> {
 }
}
button = "LeftButton"
down = false
(*temporary) = nil
(*temporary) = 1
(*temporary) = "attempt to call global 'TInv_init' (a nil value)"

AddOns:
  Swatter, v5.20.5464 (RidiculousRockrat)
  NPCScan, v5.4.8.2
  NPCScanOverlay, v5.4.8.1
  AckisRecipeList, v3.0.2
  AckisRecipeListQuickScan, v5.4.0.-1.0.8
  Armory, vv11.2.0
  ArmoryGuildBank, vv11.2.0
  AskMrRobot, v1.2.12.0
  AucAdvanced, v5.20.5464 (RidiculousRockrat)
  AucFilterBasic, v5.20.5464 (RidiculousRockrat)
  AucFilterOutlier, v5.20.5464.5459(5.20/embedded)
  AucMatchUndercut, v5.20.5464.5364(5.20/embedded)
  AucScanData, v5.20.5464 (RidiculousRockrat)
  AucStatHistogram, v5.20.5464 (RidiculousRockrat)
  AucStatiLevel, v5.20.5464 (RidiculousRockrat)
  AucStatPurchased, v5.20.5464 (RidiculousRockrat)
  AucStatSales, v5.20.5464.5376(5.20/embedded)
  AucStatSimple, v5.20.5464 (RidiculousRockrat)
  AucStatStdDev, v5.20.5464 (RidiculousRockrat)
  AucStatWOWEcon, v5.20.5464.5323(5.20/embedded)
  AucUtilAHWindowControl, v5.20.5464.5347(5.20/embedded)
  AucUtilAppraiser, v5.20.5464.5462(5.20/embedded)
  AucUtilAskPrice, v5.20.5464.5447(5.20/embedded)
  AucUtilAutoMagic, v5.20.5464.5443(5.20/embedded)
  AucUtilCompactUI, v5.20.5464.5444(5.20/embedded)
  AucUtilEasyBuyout, v5.20.5464.5458(5.20/embedded)
  AucUtilFixAH, v5.20.5464 (RidiculousRockrat)
  AucUtilItemSuggest, v5.20.5464.5417(5.20/embedded)
  AucUtilPriceLevel, v5.20.5464.5458(5.20/embedded)
  AucUtilScanButton, v5.20.5464.5403(5.20/embedded)
  AucUtilScanFinish, v5.20.5464.5347(5.20/embedded)
  AucUtilScanProgress, v5.20.5464.4979(5.20/embedded)
  AucUtilScanStart, v5.20.5464.5347(5.20/embedded)
  AucUtilSearchUI, v5.20.5464.5452(5.20/embedded)
  AucUtilSimpleAuction, v5.20.5464.5452(5.20/embedded)
  AucUtilVendMarkup, v5.20.5464.4828(5.20/embedded)
  Auctionator, v3.1.5
  Babylonian, v5.1.DEV.332(/embedded)
  BalancePowerTracker, v1.3.4
  Bartender4, v4.5.13.2
  Bartender4Powershifter, v1.0.0
  BeanCounter, v5.20.5464 (RidiculousRockrat)
  BittensSpellFlashAtonement, v50400.1.3
  BittensSpellFlashKeyBindings, v50400.1.1
  BittensSpellFlashLibrary, v50400.4.2
  BittensUtils, v50400.1.1
  CompactRaid, v3.83
  Configator, v5.1.DEV.359(/embedded)
  DBMCore, v
  DBMDefaultSkin, v
  DBMStatusBarTimers, v
  DebugLib, v5.1.DEV.337(/embedded)
  Enchantrix, v5.20.5464 (RidiculousRockrat)
  EnchantrixBarker, v5.20.5464 (RidiculousRockrat)
  GatherMate2, v1.27
  GearingGuide, v1.3.43
  Geary, v5.4.20-release
  GTFO, v4.31
  HandyNotes, v1.2.0
  HandyNotesTimelessIsleRareElites, v2.31
  HandyNotesTimelessIsleChests, v1.10
  HandynotesTimelessTreasures, v1.0-beta
  HideInCombat, v0.0.5
  IceHUD, v1.8.18.1 (Revision: 961)
  Informant, v5.20.5464 (RidiculousRockrat)
  ItemID, v1.10.1
  LibExtraTip, v5.12.DEV.363(/embedded)
  LostTreasures, v3.06
  MacroBank, v1.11
  MikScrollingBattleText, v5.7.131
  MogIt, v3.3.0
  MoveAnything, v14.0.0
  OmniCC, v5.4.3
  Postal, v3.5.1
  Quartz, v3.1.4
  QuartzProcs, v3.44
  RangeDisplay, vv4.2.4
  RareCoordinator, v
  RecipeKnown, v0.28
  Recount, v
  RemoveRaidFrameManager, v1.0.0
  SexyMap, v2.4.15
  SlideBar, v5.20.5464 (RidiculousRockrat)
  SpellFlash, v6.10
  SpellFlashX, v1.0.8 Beta
  SpellFlashCore, v2.0.4
  stAddonManager, v1.2.5
  Stubby, v5.20.5464 (RidiculousRockrat)
  TBag, v
  TellMeWhen, v7.0.1
  TidyPlates, v6.13.4
  TidyPlatesGraphite, v
  TidyPlatesGrey, v
  TidyPlatesNeon, v
  TidyPlatesQuatre, v
  TidyPlatesThreatPlates, v6.008
  TidyPlatesHub, v
  TidyPlatesWidgets, v
  TiffysJunkSeller, v1.0.3
  TimelessAnswers, vv1.2.2
  TipHelper, v5.12.DEV.351(/embedded)
  Titan, v5.2.3.50400
  TitanBag, v5.2.3.50400
  TitanClock, v5.2.3.50400
  TitanCurrency, v5.9
  TitanGold, v5.2.3.50400
  TitanLocation, v5.2.3.50400
  TitanLootType, v5.2.3.50400
  TitanPerformance, v5.2.3.50400
  TitanRepair, v5.2.3.50400
  TitanValorPoints, v4.0.001
  TitanVolume, v5.2.3.50400
  TitanXP, v5.2.3.50400
  TomTom, vv50400-1.0.0
  WIM, v3.6.18
  BlizRuntimeLib_enUS v5.4.8.50400 <us>
  (ck=ef7)

Can you reproduce this problem with TBag as the only addon loaded?

Very probably as it's addon specific

Can you reproduce this problem after renaming your stored variables file?
(WTF\Account\USERNAME\SavedVariables\TBag.lua under your WoW install, log
out of WoW, rename the file something else and log back in)

Yup!  Made one change to the window scale and hit reset.  Poof, error.

Date: 2014-07-11 10:45:13
ID: 1
Error occured in: Global
Count: 1
Message: [string "TInv_OptsFrame_Button_Reset:OnClick"] line 2:
   attempt to call global 'TInv_init' (a nil value)
Debug:
   [string "*:OnClick"]:2:
      [string "*:OnClick"]:1
Locals:
self = TInv_OptsFrame_Button_Reset {
 0 = <userdata>
 Right = <unnamed> {
 }
 Left = <unnamed> {
 }
 Middle = <unnamed> {
 }
}
button = "LeftButton"
down = false
(*temporary) = nil
(*temporary) = 1
(*temporary) = "attempt to call global 'TInv_init' (a nil value)"

AddOns:
  Swatter, v5.20.5464 (RidiculousRockrat)
  NPCScan, v5.4.8.3
  NPCScanOverlay, v5.4.8.1
  AckisRecipeList, v3.0.3
  AckisRecipeListQuickScan, v5.4.0.-1.0.8
  Armory, vv11.2.0
  ArmoryGuildBank, vv11.2.0
  AskMrRobot, v1.2.16.0
  AucAdvanced, v5.20.5464 (RidiculousRockrat)
  AucFilterBasic, v5.20.5464 (RidiculousRockrat)
  AucFilterOutlier, v5.20.5464.5459(5.20/embedded)
  AucMatchUndercut, v5.20.5464.5364(5.20/embedded)
  AucScanData, v5.20.5464 (RidiculousRockrat)
  AucStatHistogram, v5.20.5464 (RidiculousRockrat)
  AucStatiLevel, v5.20.5464 (RidiculousRockrat)
  AucStatPurchased, v5.20.5464 (RidiculousRockrat)
  AucStatSales, v5.20.5464.5376(5.20/embedded)
  AucStatSimple, v5.20.5464 (RidiculousRockrat)
  AucStatStdDev, v5.20.5464 (RidiculousRockrat)
  AucStatWOWEcon, v5.20.5464.5323(5.20/embedded)
  AucUtilAHWindowControl, v5.20.5464.5347(5.20/embedded)
  AucUtilAppraiser, v5.20.5464.5462(5.20/embedded)
  AucUtilAskPrice, v5.20.5464.5447(5.20/embedded)
  AucUtilAutoMagic, v5.20.5464.5443(5.20/embedded)
  AucUtilCompactUI, v5.20.5464.5444(5.20/embedded)
  AucUtilEasyBuyout, v5.20.5464.5458(5.20/embedded)
  AucUtilFixAH, v5.20.5464 (RidiculousRockrat)
  AucUtilItemSuggest, v5.20.5464.5417(5.20/embedded)
  AucUtilPriceLevel, v5.20.5464.5458(5.20/embedded)
  AucUtilScanButton, v5.20.5464.5403(5.20/embedded)
  AucUtilScanFinish, v5.20.5464.5347(5.20/embedded)
  AucUtilScanProgress, v5.20.5464.4979(5.20/embedded)
  AucUtilScanStart, v5.20.5464.5347(5.20/embedded)
  AucUtilSearchUI, v5.20.5464.5452(5.20/embedded)
  AucUtilSimpleAuction, v5.20.5464.5452(5.20/embedded)
  AucUtilVendMarkup, v5.20.5464.4828(5.20/embedded)
  Auctionator, v3.1.5
  Babylonian, v5.1.DEV.332(/embedded)
  BalancePowerTracker, v1.3.4
  Bartender4, v4.5.13.2
  Bartender4Powershifter, v1.0.0
  BeanCounter, v5.20.5464 (RidiculousRockrat)
  BittensSpellFlashAtonement, v50400.1.3
  BittensSpellFlashKeyBindings, v50400.1.1
  BittensSpellFlashLibrary, v50400.4.2
  BittensUtils, v50400.1.1
  CompactRaid, v3.83
  Configator, v5.1.DEV.359(/embedded)
  DBMCore, v
  DBMDefaultSkin, v
  DBMStatusBarTimers, v
  DebugLib, v5.1.DEV.337(/embedded)
  Enchantrix, v5.20.5464 (RidiculousRockrat)
  EnchantrixBarker, v5.20.5464 (RidiculousRockrat)
  GatherMate2, v1.27
  GearingGuide, v1.3.43
  Geary, v5.4.20-release
  GTFO, v4.31
  HandyNotes, v1.2.0
  HandyNotesTimelessIsleRareElites, v2.31
  HandyNotesTimelessIsleChests, v1.10
  HandynotesTimelessTreasures, v1.0-beta
  HideInCombat, v0.0.5
  IceHUD, v1.8.18.1 (Revision: 961)
  Informant, v5.20.5464 (RidiculousRockrat)
  ItemID, v1.10.1
  LibExtraTip, v5.12.DEV.363(/embedded)
  LostTreasures, v3.06
  MacroBank, v1.11
  MikScrollingBattleText, v5.7.131
  MogIt, v3.3.0
  MoveAnything, v14.0.0
  OmniCC, v5.4.3
  Postal, v3.5.1
  Quartz, v3.1.4
  QuartzProcs, v3.44
  RangeDisplay, vv4.2.4
  RareCoordinator, v
  RecipeKnown, v0.28
  Recount, v
  RemoveRaidFrameManager, v1.0.0
  SexyMap, v2.4.15
  SlideBar, v5.20.5464 (RidiculousRockrat)
  SpellFlash, v6.10
  SpellFlashX, v1.0.8 Beta
  SpellFlashCore, v2.0.4
  stAddonManager, v1.2.5
  Stubby, v5.20.5464 (RidiculousRockrat)
  TBag, v
  TellMeWhen, v7.0.1
  TidyPlates, v6.13.4
  TidyPlatesGraphite, v
  TidyPlatesGrey, v
  TidyPlatesNeon, v
  TidyPlatesQuatre, v
  TidyPlatesThreatPlates, v6.008
  TidyPlatesHub, v
  TidyPlatesWidgets, v
  TiffysJunkSeller, v1.0.3
  TimelessAnswers, vv1.2.2
  TipHelper, v5.12.DEV.351(/embedded)
  Titan, v5.2.3.50400
  TitanBag, v5.2.3.50400
  TitanClock, v5.2.3.50400
  TitanCurrency, v5.9
  TitanGold, v5.2.3.50400
  TitanLocation, v5.2.3.50400
  TitanLootType, v5.2.3.50400
  TitanPerformance, v5.2.3.50400
  TitanRepair, v5.2.3.50400
  TitanValorPoints, v4.0.001
  TitanVolume, v5.2.3.50400
  TitanXP, v5.2.3.50400
  TomTom, vv50400-1.0.0
  WIM, v3.6.18
  BlizRuntimeLib_enUS v5.4.8.50400 <us>
  (ck=ef7)

Please provide any additional information below.