Was sagt denn das crash log dazu? Schau mal mit der App "Konsole" nach, liegt in den Dienstprogrammen...
03.09.10 17:06:43 iTunes[473] Error loading /Users/sinemyesilcay/Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter: dlopen(/Users/sinemyesilcay/Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter, 262): no suitable image found. Did find:
/Users/sinemyesilcay/Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter: mach-o, but wrong architecture
03.09.10 17:06:44 iTunes[473] Error loading /Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter: dlopen(/Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter, 262): no suitable image found. Did find:
/Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter: mach-o, but wrong architecture
03.09.10 17:06:44 iTunes[473] Error loading /Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter: dlopen(/Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter, 262): no suitable image found. Did find:
/Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter: mach-o, but wrong architecture
03.09.10 17:06:44 iTunes[473] Error loading /Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter: dlopen(/Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter, 262): no suitable image found. Did find:
/Library/QuickTime/AviImporter-r7 (ppc).component/Contents/MacOS/AviImporter: mach-o, but wrong architecture
03.09.10 17:06:44 [0x0-0x37037].com.apple.iTunes[473] iTunes(473,0xa02c7500) malloc: *** error for object 0x13b44400: pointer being freed was not allocated
03.09.10 17:06:44 [0x0-0x37037].com.apple.iTunes[473] *** set a breakpoint in malloc_error_break to debug
03.09.10 17:06:47 com.apple.launchd[1] (com.digidesign.elevenrack.helper[477]) posix_spawn("/Library/PreferencePanes/Digidesign Eleven Rack.prefPane/Contents/Resources/LaunchdDaemon", ...): No such file or directory
03.09.10 17:06:47 com.apple.launchd[1] (com.digidesign.elevenrack.helper[477]) Exited with exit code: 1
03.09.10 17:06:47 com.apple.launchd[1] (com.digidesign.elevenrack.helper) Throttling respawn: Will start in 10 seconds
03.09.10 17:06:48 com.apple.launchd.peruser.501[120] ([0x0-0x37037].com.apple.iTunes[473]) Job appears to have crashed: Abort trap
03.09.10 17:06:49 ReportCrash[476] Saved crash report for iTunes[473] version 10.0 (10.0) to /Users/sinemyesilcay/Library/Logs/DiagnosticReports/iTunes_2010-09-03-170649_localhost.crash
03.09.10 17:06:57 com.apple.launchd[1] (com.digidesign.elevenrack.helper[484]) posix_spawn("/Library/PreferencePanes/Digidesign Eleven Rack.prefPane/Contents/Resources/LaunchdDaemon", ...): No such file or directory
03.09.10 17:06:57 com.apple.launchd[1] (com.digidesign.elevenrack.helper[484]) Exited with exit code: 1
03.09.10 17:06:57 com.apple.launchd[1] (com.digidesign.elevenrack.helper) Throttling respawn: Will start in 10 seconds
03.09.10 17:07:07 com.apple.launchd[1] (com.digidesign.elevenrack.helper[485]) posix_spawn("/Library/PreferencePanes/Digidesign Eleven Rack.prefPane/Contents/Resources/LaunchdDaemon", ...): No such file or directory
03.09.10 17:07:07 com.apple.launchd[1] (com.digidesign.elevenrack.helper[485]) Exited with exit code: 1