IB 3.1.2 crash: seems to be from plist info

Question

I hope this is the right place for this question. I have just started to use IB, so please forgive my lack of basic knowledge regarding it. IB is crashing for me and not for other users on my laptop. I'm sure this must be just as simple as removing a Library/Preferences folder. I just don't know which one. I have read in this topic that doing a removal of /Developer can help this. I have done so and get the same results. When I move my entire ~/Library/Preferences out of the way, the problem indeed goes away.
It looks as if it reads the plugin and AppKit and then dies. So I will try to look for appkit settings next. The thread trace back is here:
Date/Time: 2009-08-03 12:34:40.181 -0400
OS Version: Mac OS X 10.5.7 (9J61)
Report Version: 6
Anonymous UUID: 18F93778-7497-4F66-BF78-95F618481B21
Exception Type: EXCBADACCESS (SIGBUS)
Exception Codes: KERNPROTECTIONFAILURE at 0x0000000000000010
Crashed Thread: 0
Thread 0 Crashed:
0 com.apple.CoreFoundation 0x92c90254 CFRetain + 36
1 com.apple.HIToolbox 0x92a2b472 TThemeFont::SetCTFont(__CTFont const*) + 62
2 com.apple.HIToolbox 0x92a2b400 TThemeSpecifiedFont::Init(THIThemeTextInfo const*) + 32
3 com.apple.HIToolbox 0x92938c9b ThemeFontCreate(THIThemeTextInfo const*) + 239
4 com.apple.HIToolbox 0x92938b6d TThemeText::ConstructThemeFontWithFontID(__CFString const*, THIThemeTextInfo const*) + 79
5 com.apple.HIToolbox 0x92938a31 TCoreTextEngine::Init(void const*, THIThemeTextInfo const*) + 159
6 com.apple.HIToolbox 0x92938769 TThemeTextCache::Create(void const*, THIThemeTextInfo const*) + 177
7 com.apple.HIToolbox 0x92938641 ThemeTextCreate(void const*, THIThemeTextInfo const*) + 33
8 com.apple.HIToolbox 0x9293839d DataEngine::GetTextDimensions(void const*, float, HIThemeTextInfo*, float*, float*, float*) + 289
9 com.apple.HIToolbox 0x92938238 HIThemeGetTextDimensions + 202
10 com.apple.HIToolbox 0x92ad7aad HIClockView::CalculateTextDimensions() + 133
11 com.apple.HIToolbox 0x92ad7c82 HIClockView::GetOptimalSizeSelf(CGSize*, float*) + 118
12 com.apple.HIToolbox 0x92974479 HIView::SendGetOptimalBounds(CGRect*, float*) + 151
13 com.apple.HIToolbox 0x929743b9 HIView::GetOptimalSize(CGSize*, float*) + 53
14 com.apple.HIToolbox 0x929c7c3d GetBestControlRect + 105
15 ...terfaceBuilder.CarbonPlugin 0x16b0c27a IBWindowForHostingCarbonControls + 9638
16 ...terfaceBuilder.CarbonPlugin 0x16b0cb1f IBWindowForHostingCarbonControls + 11851
17 ...terfaceBuilder.CarbonPlugin 0x16b0d766 IBWindowForHostingCarbonControls + 14994
18 ...terfaceBuilder.CarbonPlugin 0x16b0e7c8 IBWindowForHostingCarbonControls + 19188
19 ...terfaceBuilder.CarbonPlugin 0x16b0617a 0x16b00000 + 24954
20 com.apple.InterfaceBuilderKit 0x002c65e0 -IBLibraryObjectTemplate classesOfPasteboardObjects + 194
21 com.apple.InterfaceBuilderKit 0x002c64b9 -IBLibraryController typeSummaryForObjectTemplate: + 106
22 com.apple.InterfaceBuilderKit 0x002c5fc4 -IBLibraryController createAssetForTemplate:inNamespace: + 554
23 com.apple.InterfaceBuilderKit 0x002c4fe3 -IBLibraryController createAssetsFromTemplatesInNibNamed:forPlugin: + 746
24 com.apple.InterfaceBuilderKit 0x002c499e -IBLibraryController loadLibraryObjectsForPlugin: + 287
25 com.apple.InterfaceBuilderKit 0x002c414e -IBPlugin didLoad + 480
26 ...terfaceBuilder.CarbonPlugin 0x16b0566f 0x16b00000 + 22127
27 com.apple.InterfaceBuilderKit 0x002c389f -IBPluginController loadPluginAtPath:error: + 2809
28 com.apple.InterfaceBuilder3 0x00002345 0x1000 + 4933
29 com.apple.AppKit 0x9434e333 -NSApplication run + 83
30 com.apple.AppKit 0x9431b834 NSApplicationMain + 574
31 com.apple.InterfaceBuilder3 0x00004eca 0x1000 + 16074

Answer 1

Also, I had done the iPhone OS 3.0.1 update today by creating the symlink the doc asks for.
ln -s /Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.0\ \(7A341\) \
/Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.0.1
What I see in that dir is now a .dmg file. Does that seem like it's expected?