Also have discovered the demo screensaver that comes with XCode 3.1.2, located 
at 
  /Developer/Library/Quartz Composer/Examples/Screen Saver/Security.qtz
causes similar crashes.

Can anyone else confirm?  

On Jan 17, 2010, at 9:44 AM, Michael Diehr wrote:

> Using 10.6.2 with QC 4.0 (103.1) and QuickTime Player 7.6.3 (630) installed.
> 
> To reproduce:
> 
> * Open Quartz Composer
> * Choose "Screen Saver" template
> * Drag a movie file (I've tested both AVI and H264) to the window and connect 
> the movie's output to the image input
> * save the .qtz file and copy it to ~/Library/Screen Savers
> * open system preferences and select the screensaver
> 
> Result:  Crash.
> 
> Can anyone else reproduce this behavior?  If so, please let me know and I'll 
> report it to apple...
> 
> 
> Process:         System Preferences [360]
> Path:            /Applications/System Preferences.app/Contents/MacOS/System 
> Preferences
> Identifier:      com.apple.systempreferences
> Version:         7.0 (7.0)
> Build Info:      SystemPrefsApp-1750100~6
> Code Type:       X86-64 (Native)
> Parent Process:  launchd [177]
> 
> Date/Time:       2010-01-17 09:41:42.101 -0800
> OS Version:      Mac OS X 10.6.2 (10C540)
> Report Version:  6
> 
> Interval Since Last Report:          671509 sec
> Crashes Since Last Report:           19
> Per-App Interval Since Last Report:  48612 sec
> Per-App Crashes Since Last Report:   8
> Anonymous UUID:                      61D6E13F-C6B2-4D6A-B995-918E53DFF496
> 
> Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
> Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000001686
> Crashed Thread:  0  Dispatch queue: com.apple.main-thread
> 
> Application Specific Information:
> objc_msgSend() selector name: copyCurrentImageBuffer
> objc[360]: garbage collection is ON
> |ScreenSaver|running|kitten-qtz
> 
> Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
> 0   libobjc.A.dylib                   0x00007fff864cf10a objc_msgSend + 22
> 1   com.apple.QTKit                   0x00007fff828c6ced 
> -[QTMovieVideoProviderQuartzComposerOnly copyCurrentPixelBuffer] + 38
> 2   ...QuartzComposer.ExtraPatches    0x0000000111083455 0x111070000 + 78933
> 3   com.apple.QuartzComposer          0x00007fff82ea1e0d -[QCPatch(Private) 
> _renderAtTime:arguments:] + 108
> 4   com.apple.QuartzComposer          0x00007fff82ea1d73 -[QCRenderingManager 
> addPatch:context:time:arguments:nextExecutionTime:] + 3089
> 5   com.apple.QuartzComposer          0x00007fff82ea06b6 -[QCPatch(Private) 
> __execute:arguments:] + 826
> 6   com.apple.QuartzComposer          0x00007fff82ea0301 -[QCPatch(Private) 
> _execute:arguments:] + 2289
> 7   com.apple.QuartzComposer          0x00007fff82ea102f -[QCPort 
> _execute:arguments:] + 419
> 8   com.apple.QuartzComposer          0x00007fff82ea0132 -[QCPatch(Private) 
> _execute:arguments:] + 1826
> 9   com.apple.QuartzComposer          0x00007fff82ea102f -[QCPort 
> _execute:arguments:] + 419
> 10  com.apple.QuartzComposer          0x00007fff82ea0132 -[QCPatch(Private) 
> _execute:arguments:] + 1826
> 11  com.apple.QuartzComposer          0x00007fff82ea0d55 -[QCPatch(Private) 
> _executeSubpatches:arguments:] + 290
> 12  com.apple.QuartzComposer          0x00007fff82ea0b68 
> -[QCPatch(Customization) nextExecutionTimeForSubpatches:time:arguments:] + 173
> 13  com.apple.QuartzComposer          0x00007fff82ea0a68 
> -[QCPatch(Customization) nextExecutionTime:time:arguments:] + 74
> 14  com.apple.QuartzComposer          0x00007fff82ea09c4 -[QCPatch(Private) 
> _nextExecutionTime:arguments:] + 704
> 15  com.apple.QuartzComposer          0x00007fff82ea065e -[QCPatch(Private) 
> __execute:arguments:] + 738
> 16  com.apple.QuartzComposer          0x00007fff82ea0301 -[QCPatch(Private) 
> _execute:arguments:] + 2289
> 17  com.apple.QuartzComposer          0x00007fff82e9e3d1 -[QCContext 
> nextExecutionTimeForPatch:time:arguments:] + 455
> 18  com.apple.QuartzComposer          0x00007fff82e9e208 -[QCGraphicsContext 
> nextExecutionTimeForPatch:time:arguments:] + 39
> 19  com.apple.QuartzComposer          0x00007fff82e9dfd7 -[QCOpenGLContext 
> nextExecutionTimeForPatch:time:arguments:] + 469
> 20  ....screensaver.QuartzComposer    0x0000000110e30205 _SortFunction + 2661
> 21  ....screensaver.QuartzComposer    0x0000000110e304ab _SortFunction + 3339
> 22  ....screensaver.QuartzComposer    0x0000000110e33109 _SortFunction + 14697
> 23  com.apple.Foundation              0x00007fff8322c434 
> __NSFireDelayedPerform + 404
> 24  com.apple.CoreFoundation          0x00007fff8799ea58 __CFRunLoopRun + 6488
> 25  com.apple.CoreFoundation          0x00007fff8799cc2f CFRunLoopRunSpecific 
> + 575
> 26  com.apple.HIToolbox               0x00007fff86afba4e 
> RunCurrentEventLoopInMode + 333
> 27  com.apple.HIToolbox               0x00007fff86afb853 
> ReceiveNextEventCommon + 310
> 28  com.apple.HIToolbox               0x00007fff86afb70c 
> BlockUntilNextEventMatchingListInMode + 59
> 29  com.apple.AppKit                  0x00007fff818ab1f2 _DPSNextEvent + 708
> 30  com.apple.AppKit                  0x00007fff818aab41 -[NSApplication 
> nextEventMatchingMask:untilDate:inMode:dequeue:] + 155
> 31  com.apple.AppKit                  0x00007fff81870747 -[NSApplication run] 
> + 395
> 32  com.apple.AppKit                  0x00007fff81869468 NSApplicationMain + 
> 364
> 33  com.apple.systempreferences       0x0000000100001cf4 0x100000000 + 7412 
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