I also have this problem. QC won't start at all. Only crashes on launch.
Any ideas?
Crash Log:
****************
Process: Quartz Composer [26581]
Path: /Applications/Quartz Composer.app/Contents/MacOS/Quartz Composer
Identifier: com.apple.QuartzComposer.editor
Version: 4.6 (148)
Build Info: QuartzComposerEditor-148000000000000~175
Code Type: X86-64 (Native)
Parent Process: launchd [140]
User ID: 501
Date/Time: 2013-06-19 10:02:46.673 +0200
OS Version: Mac OS X 10.8.4 (12E55)
Report Version: 10
Interval Since Last Report: 154946 sec
Crashes Since Last Report: 2
Per-App Interval Since Last Report: 11 sec
Per-App Crashes Since Last Report: 2
Anonymous UUID: 24A85120-4CA8-144C-9B63-41009AAC1648
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
[26581] stack overflow
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff92314212 __pthread_kill + 10
1 libsystem_c.dylib 0x00007fff8d4c3b54 pthread_kill + 90
2 libsystem_c.dylib 0x00007fff8d507e9e __abort + 159
3 libsystem_c.dylib 0x00007fff8d508d17 __stack_chk_fail + 195
4 com.apple.QuartzComposer 0x00007fff96aeb200 -[QCView _initializeRenderView] + 1490
5 com.apple.QuartzComposer 0x00007fff96aeb5fa -[QCView _finishInitialization] + 295
6 com.apple.QuartzComposer 0x00007fff96aed635 -[QCView initWithCoder:] + 725
7 com.apple.AppKit 0x00007fff9535cb1c -[NSClassSwapper initWithCoder:] + 546
8 com.apple.Foundation 0x00007fff91bee979 _decodeObjectBinary + 2741
9 com.apple.Foundation 0x00007fff91bef756 -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] + 1189
10 com.apple.Foundation 0x00007fff91befcc8 -[NSArray(NSArray) initWithCoder:] + 538
11 com.apple.Foundation 0x00007fff91bee979 _decodeObjectBinary + 2741
12 com.apple.Foundation 0x00007fff91bedd24 _decodeObject + 226
13 com.apple.AppKit 0x00007fff951e1601 -[NSView initWithCoder:] + 976
14 com.apple.Foundation 0x00007fff91bee979 _decodeObjectBinary + 2741
15 com.apple.Foundation 0x00007fff91bedd24 _decodeObject + 226
16 com.apple.AppKit 0x00007fff951e2b35 -[NSResponder initWithCoder:] + 99
17 com.apple.AppKit 0x00007fff951e1294 -[NSView initWithCoder:] + 99
18 com.apple.AppKit 0x00007fff951e2ecd -[NSControl initWithCoder:] + 50
19 com.apple.AppKit 0x00007fff951e2d73 -[NSButton initWithCoder:] + 42
20 com.apple.AppKit 0x00007fff9535cb1c -[NSClassSwapper initWithCoder:] + 546
21 com.apple.Foundation 0x00007fff91bee979 _decodeObjectBinary + 2741
22 com.apple.Foundation 0x00007fff91bedd24 _decodeObject + 226
23 com.apple.AppKit 0x00007fff951d8914 -[NSNibConnector initWithCoder:] + 401
24 com.apple.AppKit 0x00007fff951d8778 -[NSNibOutletConnector initWithCoder:] + 344
25 com.apple.Foundation 0x00007fff91bee979 _decodeObjectBinary + 2741
26 com.apple.Foundation 0x00007fff91bef756 -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] + 1189
27 com.apple.Foundation 0x00007fff91befcc8 -[NSArray(NSArray) initWithCoder:] + 538
28 com.apple.Foundation 0x00007fff91bee979 _decodeObjectBinary + 2741
29 com.apple.Foundation 0x00007fff91bedd24 _decodeObject + 226
30 com.apple.AppKit 0x00007fff951d79ea -[NSIBObjectData initWithCoder:] + 2025
31 com.apple.Foundation 0x00007fff91bee979 _decodeObjectBinary + 2741
32 com.apple.Foundation 0x00007fff91bedd24 _decodeObject + 226
33 com.apple.AppKit 0x00007fff951d70c3 loadNib + 227
34 com.apple.AppKit 0x00007fff951d6649 +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 219
35 com.apple.AppKit 0x00007fff9532958c +[NSBundle(NSNibLoading) loadNibFile:externalNameTable:withZone:] + 140
36 com.apple.AppKit 0x00007fff9535c5db -[NSWindowController loadWindow] + 199
37 com.apple.AppKit 0x00007fff9535c2b5 -[NSWindowController window] + 77
38 com.apple.AppKit 0x00007fff9539cb79 -[NSWindowController showWindow:] + 53
39 com.apple.QuartzComposer.editor 0x000000010996eee4 0x10996a000 + 20196
40 com.apple.AppKit 0x00007fff9523dbe0 -[NSApplication _doOpenUntitled] + 398
41 com.apple.AppKit 0x00007fff9523d6cf __58-[NSApplication(NSAppleEventHandling) _handleAEOpenEvent:]_block_invoke_0 + 233
42 com.apple.AppKit 0x00007fff9557f6c1 __78-[NSDocumentController(NSInternal) _autoreopenDocumentsWithCompletionHandler:]_block_invoke_01437 + 143
43 com.apple.AppKit 0x00007fff9523d17b -[NSDocumentController(NSInternal) _autoreopenDocumentsWithCompletionHandler:] + 760
44 com.apple.AppKit 0x00007fff951966d4 -[NSPersistentUIManager finishedRestoringWindowsWithZOrder:registerAsReady:completionHandler:] + 6759
45 com.apple.AppKit 0x00007fff9518b11f -[NSPersistentUIManager restoreAllPersistentStateRegisteringAsReadyWhenDone:completionHandler:] + 597
46 com.apple.AppKit 0x00007fff9523b445 -[NSApplication(NSAppleEventHandling) _handleAEOpenEvent:] + 553
47 com.apple.AppKit 0x00007fff9523b04c -[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 351
48 com.apple.Foundation 0x00007fff91c0207b -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 308
49 com.apple.Foundation 0x00007fff91c01edd _NSAppleEventManagerGenericHandler + 106
50 com.apple.AE 0x00007fff90b0f078 aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned int, unsigned char*) + 307
51 com.apple.AE 0x00007fff90b0eed9 dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 37
52 com.apple.AE 0x00007fff90b0ed99 aeProcessAppleEvent + 318
53 com.apple.HIToolbox 0x00007fff95fd7709 AEProcessAppleEvent + 100
54 com.apple.AppKit 0x00007fff95237836 _DPSNextEvent + 1456
55 com.apple.AppKit 0x00007fff95236df2 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
56 com.apple.AppKit 0x00007fff9522e1a3 -[NSApplication run] + 517
57 com.apple.QuartzComposer.editor 0x000000010996c409 0x10996a000 + 9225
58 com.apple.AppKit 0x00007fff951d2bd6 NSApplicationMain + 869
59 com.apple.QuartzComposer.editor 0x000000010996b774 0x10996a000 + 6004