What steps will reproduce the problem?
1. Place objects in three windows of the FarmIt list (the very lowest and two above)
2. Set the 'goal' number to all three (to 40 in my case, in case the issue is the number)
3. Log out.
4. Log back in.

What is the expected output? What do you see instead?
I expected to see the three boxes filled with fish (as I was farming for said fish). I saw nothing at all. The '+' and '-' are still there, but the boxes which should contain the fish do not exist.

What version of the product are you using?
The latest one, as posted on Curse.com.

Do you have an error log of what happened?
Yes, reproduced below:
Date: 2009-01-28 12:18:11
ID: 2
Error occured in: Global
Count: 49
Message: ..\AddOns\FarmIt\FarmIt.lua line 452:
   attempt to index a nil value
Debug:
   [C]: ?
   FarmIt\FarmIt.lua:452 FI_Update()
   FarmIt\FarmIt.lua:618 FI_SetObjective()
   FarmIt\FarmIt.lua:402 FI_SetSlot()
   FarmIt\FarmIt.lua:350 FI_CreateBar()
   FarmIt\FarmIt.lua:200 FI_Loader()
   FarmIt\FarmIt.lua:163 FI_OnEvent()
   [string "*:OnEvent"]:1:
      [string "*:OnEvent"]:1
AddOns:
  Swatter, v3.1.9 (<%codename%>)
  Ace2, v
  Ace3, v
  AucAdvanced, v5.2.4013 (DingoII)
  AucFilterBasic, v5.2.4013 (DingoII)
  AucFilterOutlier, v5.2.4013.2531
  AucMatchUndercut, v5.2.4013.2531
  AucStatClassic, v5.2.4013 (DingoII)
  AucStatHistogram, v5.2.4013 (DingoII)
  AucStatiLevel, v5.2.4013 (DingoII)
  AucStatPurchased, v5.2.4013 (DingoII)
  AucStatSales, v5.2.4013.2842
  AucStatSimple, v5.2.4013 (DingoII)
  AucStatStdDev, v5.2.4013 (DingoII)
  AucStatWOWEcon, v5.2.4013.2530
  AucUtilAHWindowControl, v5.2.4013.3311
  AucUtilAppraiser, v5.2.4013.2530
  AucUtilAskPrice, v5.2.4013.3175
  AucUtilAutoMagic, v5.2.4013.3142
  AucUtilCompactUI, v5.2.4013.2530
  AucUtilEasyBuyout, v5.2.4013.3583
  AucUtilItemSuggest, v5.2.4013.3108
  AucUtilPriceLevel, v5.2.4013.2545
  AucUtilScanButton, v5.2.4013.2530
  AucUtilScanFinish, v5.2.4013.2530
  AucUtilScanProgress, v5.2.4013.2530
  AucUtilSearchUI, v5.2.4013.3655
  AucUtilSimpleAuction, v5.2.4013.0
  AucUtilVendMarkup, v5.2.4013.2530
  AuldLangSyne, v2.0
  AuldLangSyneBackup, v2.0
  AuldLangSyneFriendList, v2.0
  AuldLangSyneFu, v2.0
  AuldLangSyneGuildList, v2.0
  AuldLangSyneInfo, v2.0
  AuldLangSyneNote, v2.0
  AuldLangSynePanel, v2.0
  AuldLangSyneSync, v2.0
  AutoTurnin, v3.0.6
  Babylonian, v5.1.DEV.130
  BaudBag, v1.4
  BeanCounter, v5.2.4013 (DingoII)
  BossTalk, v3.5135
  Cartographer, v2.0
  Configator, v5.1.DEV.130
  CooldownTimers3, v3.0 Beta
  CritAlert, v3.3.0.30000
  DBMBurningCrusade, v
  DBMCore, v
  DebugLib, v5.1.DEV.130
  DruidBar, v4.22
  Enchantrix, v5.2.4013 (DingoII)
  EnchantrixBarker, v5.2.4013 (DingoII)
  FarmIt, v
  SlideBar, v3.1.9 (<%codename%>)
  Stubby, v5.2.4013 (DingoII)
  (ck=68e)

Please provide any additional information below.
Filling only one box with the objects does not seem to cause the issues; I log in and out plenty with one 'tracked' item, and have never had the boxes disappear. It wasn't until I was doing a multi-fish that it happened.