Login window crashing

Question

Hello, I'v got an odd intermittent issue.... After entering my (correct) credentials into the login window the login window appears to freeze and prevents login.
I can move the mouse just fine, but the loginwindow becomes unresponsive. Trying other accounts on the Mac yields hte same results. I can drop into a shell by logging in as >console and I can login just fine in through safemode.  This had me suspecting thrid party addins, but the problem persists when all addins (that I could find..) are disabled.  This problem origionally happened a month ago and the fix was to remove third party launche agents/darmons.  However the problem surfaced again today with some weirder results. The loginwindow froze, I sshed in and triggerd a reboot. The next login attempt caused iCal to pop up through the frozen login window (I also opened quicktime and got a screen recording). I was able to get terminal open via spotlight. I launched Finder manually, but I couldn't get the dock to open. This problem is really annoying becuase I was using my laptop all day without issue.
Throughout, the way I've been toubleshoot this I would ssh into the mac from another Mac and grabbed the contents of system.log (below). I can see loginwondow crashing out in the log. I can also "kick it" with launchctl but I get the same result.
I've also all of Onyx's cleaning routines, manually purged Cache and Application Saved State folders, repaired permssions, and ran Daily/Weekly/Monthly tasks to no avail.
I don't really don't want to reinstall Lion if at all possible, any advise would be great. Thank you!
MacBook pro 15" Mid 2011
8GB RAM
Mac OS X 10.7.2 server
bash-3.2# tail -f /var/log/system.log
Nov 30 22:57:59: --- last message repeated 1 time ---
Nov 30 22:57:59 Tesseract loginwindow[421]: Login Window Started Security Agent
Nov 30 22:57:59 Tesseract airportd[425]: _doAutoJoin: Already associated to “Emerald”. Bailing on auto-join.
Nov 30 22:57:59 Tesseract SecurityAgent[432]: Echo enabled
Nov 30 22:57:59 Tesseract SystemUIServer[437]: 3891612: (connectAndCheck) Untrusted apps are not allowed to connect to or launch Window Server before login.
Nov 30 22:57:59 Tesseract SystemUIServer[437]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
Nov 30 22:57:59 Tesseract SystemUIServer[437]: _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
Nov 30 22:57:59 Tesseract com.apple.SystemUIServer.agent[437]: _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
Nov 30 22:57:59 Tesseract com.apple.SystemUIServer.agent[437]: Creating secondary hot key connection failed, 1000
Nov 30 22:57:59 Tesseract SystemUIServer[437]: ICNInitialize failed: -536870212
Nov 30 22:58:21 Tesseract SecurityAgent[432]: User info context values set for sonic84
Nov 30 22:58:21 Tesseract SecurityAgent[432]: Login Window login proceeding
Nov 30 22:58:22 Tesseract loginwindow[421]: Login Window - Returned from Security Agent
Nov 30 22:58:22 Tesseract loginwindow[421]: USER_PROCESS: 421 console
Nov 30 22:58:22 Tesseract applepushserviced[93]: Unable to bootstrap_lookup connection port for 'com.apple.iCalPush': unknown error code
Nov 30 22:58:22 Tesseract airportd[425]: _doAutoJoin: Already associated to “Emerald”. Bailing on auto-join.
Nov 30 22:58:22 Tesseract applepushserviced[93]: <APSCourier: 0x7fbdbbb07660>: Stream error occurred for <APSTCPStream: 0x7fbdbda00ff0>: Error Domain=APSTCPStreamErrorDomain Code=-65563 "DNSServiceQueryRecord() failed" UserInfo=0x7fbdbda01c20 {NSLocalizedDescription=DNSServiceQueryRecord() failed}
Nov 30 22:58:22 Tesseract com.apple.launchd.peruser.501[374] (com.apple.ReportCrash): Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
Nov 30 22:58:22 Tesseract com.apple.launchctl.Aqua[459]: com.apple.RemoteDesktop.agent: Already loaded
Nov 30 22:58:22: --- last message repeated 1 time ---
Nov 30 22:58:22 Tesseract com.apple.launchctl.Aqua[459]: load: option requires an argument -- D
Nov 30 22:58:22 Tesseract com.apple.launchctl.Aqua[459]: usage: launchctl load [-wF] [-D <user|local|network|system|all>] paths...
Nov 30 22:58:22 Tesseract loginwindow[421]: -[__NSCFConstantString count]: unrecognized selector sent to instance 0x107fe38e0
Nov 30 22:58:22: --- last message repeated 1 time ---
Nov 30 22:58:22 Tesseract loginwindow[421]: (
                    0   CoreFoundation                      0x0000000107e90286 __exceptionPreprocess + 198
                    1   libobjc.A.dylib                     0x0000000107cfdd5e objc_exception_throw + 43
                    2   CoreFoundation                      0x0000000107f1c4ce -[NSObject doesNotRecognizeSelector:] + 190
                    3   CoreFoundation                      0x0000000107e7d133 ___forwarding___ + 371
                    4   CoreFoundation                      0x0000000107e7cf48 _CF_forwarding_prep_0 + 232
                    5   loginwindow                         0x00000001056b72c9 loginwindow + 74441
                    6   loginwindow                         0x00000001056b7293 loginwindow + 74387
                    7   loginwindow                         0x00000001056b4646 loginwindow + 63046
                    8   CoreFoundation                      0x0000000107e7fa1d -[NSObject performSelector:withObject:] + 61
                    9   Foundation                          0x00000001071aae44 __NSThreadPerformPerform + 214
                    10  CoreFoundation                      0x0000000107dfeb51 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
                    11  CoreFoundation                      0x0000000107dfe3bd __CFRunLoopDoSources0 + 253
                    12  CoreFoundation                      0x0000000107e251a9 __CFRunLoopRun + 905
                    13  CoreFoundation                      0x0000000107e24ae6 CFRunLoopRunSpecific + 230
                    14  HIToolbox                           0x000000010c4be3d3 RunCurrentEventLoopInMode + 277
                    15  HIToolbox                           0x000000010c4c563d ReceiveNextEventCommon + 355
                    16  HIToolbox                           0x000000010c4c54ca BlockUntilNextEventMatchingListInMode + 62
                    17  AppKit                              0x0000000105e233f1 _DPSNextEvent + 659
                    18  AppKit                              0x0000000105e22cf5 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 135
                    19  AppKit                              0x0000000105e1f62d -[NSApplication run] + 470
                    20  loginwindow                         0x00000001056aa142 loginwindow + 20802
                    21  loginwindow                         0x00000001056a9bf0 loginwindow + 19440
Nov 30 22:58:22 Tesseract com.apple.launchd.peruser.501[374] (com.apple.launchctl.Aqua[459]): Exited with code: 1
Nov 30 22:58:22 Tesseract UserEventAgent[17]: CaptiveNetworkSupport:CNSServerRegisterUserAgent:187 new user agent port: 48435
^C
bash-3.2# launchctl unload /System/Library/LaunchDaemons/com.apple.loginwindow.plist
bash-3.2# launchctl load /System/Library/LaunchDaemons/com.apple.loginwindow.plist
bash-3.2# reboot

Answer 1

Well I may have answered my own question. I removed the contents of /Library/Internet Plug-ins and removed third-party preference panes. I can login just fine now.
Oddly, I can still login just fine after re-installing fresh copies of said plugins and preferences...
Here is a link to the movie I mentioned in my last post (~7MB): http://www.sonic84.com/files/LoginWindowCrashing.mov
for the record, I removed:
Pref panes:
Flash Player
Flip4Mac WMV
MacFUSE (Tuxera)
Perian
Tuxera NTFS
Internet Plugins:
CitrixICAClientPlugIn.plugin
Flash player.plugin
Flip4Mac.plugin
JavaAppletPlugin.plugin
QuickTime.plugin
SharePointBrowserPlugin.plugin
SharePointWebKitPlugin.webplugin
Silverlight.plugin
flashplayer.xpt
iPhotoPhotocast.plugin
nsIQTScriptablePlugin.xpt