I am also expierencing frequent crashes when premiere quits.
here's the log.
Process: Adobe Premiere Pro CS6 [10456]
Path: /Applications/Adobe Premiere Pro CS6/Adobe Premiere Pro CS6.app/Contents/MacOS/Adobe Premiere Pro CS6
Identifier: com.adobe.AdobePremierePro
Version: 6.0.2 (6.0.2)
Code Type: X86-64 (Native)
Parent Process: launchd [156]
User ID: 501
Date/Time: 2013-04-06 21:00:54.676 -0400
OS Version: Mac OS X 10.8.3 (12D78)
Report Version: 10
Interval Since Last Report: 72042 sec
Crashes Since Last Report: 2
Per-App Interval Since Last Report: 23541 sec
Per-App Crashes Since Last Report: 2
Anonymous UUID: 65E91A24-2173-C326-1486-2F27F0515D0E
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 com.adobe.premiere.frontend 0x000000010c72b74b FE::Application::AttemptPanicProjectSave() + 21
1 com.adobe.premiere.frontend 0x000000010c78327c UnixInterruptSignal(int) + 44
2 com.adobe.dvacore.framework 0x0000000100279b15 (anonymous namespace)::SignalHandler(int, __siginfo*, void*) + 261
3 libsystem_c.dylib 0x00007fff9062694a _sigtramp + 26
4 libsystem_c.dylib 0x00007fff9063dbf9 pthread_mutex_lock + 20
5 com.adobe.VideoRenderer.framework 0x00000001042efcae StrongPluginIDMap::ReleaseReference(int) + 40
6 com.adobe.VideoRenderer.framework 0x0000000104303246 ML::SDKCallback_PrSDKVideoSegmentSuite_ReleaseVideoNodeID(int) + 22
7 com.adobe.RendererGPU.framework 0x00000001260a49ac VideoNodeIDOwner::~VideoNodeIDOwner() + 150
8 com.adobe.RendererGPU.framework 0x00000001260a43e9 boost::detail::sp_counted_impl_p<VideoNodeIDOwner>::dispose() + 33
9 com.adobe.RendererGPU.framework 0x00000001260a2a24 VideoNode::~VideoNode() + 66
10 com.adobe.RendererGPU.framework 0x00000001260a5566 VideoMediaNode::~VideoMediaNode() + 30
11 com.adobe.RendererGPU.framework 0x000000012608ef2d RenderNodeBase::~RenderNodeBase() + 133
12 com.adobe.RendererGPU.framework 0x000000012602b8f5 RendererGPU::NestedTimelineNode::~NestedTimelineNode() + 79
13 com.adobe.RendererGPU.framework 0x000000012602b962 RendererGPU::NestedTimelineNode::Release() + 50
14 com.adobe.RendererGPU.framework 0x00000001260233f0 std::_Rb_tree<ASL::InterfaceRef<IRenderNode, IRenderNode>, ASL::InterfaceRef<IRenderNode, IRenderNode>, std::_Identity<ASL::InterfaceRef<IRenderNode, IRenderNode> >, std::less<ASL::InterfaceRef<IRenderNode, IRenderNode> >, dvacore::utility::SmallBlockAllocator::STLAllocator<ASL::InterfaceRef <IRenderNode, IRenderNode> > >::_M_erase(std::_Rb_tree_node<ASL::InterfaceRef<IRenderNode, IRenderNode> >*) + 106
15 com.adobe.RendererGPU.framework 0x00000001260233bc std::_Rb_tree<ASL::InterfaceRef<IRenderNode, IRenderNode>, ASL::InterfaceRef<IRenderNode, IRenderNode>, std::_Identity<ASL::InterfaceRef<IRenderNode, IRenderNode> >, std::less<ASL::InterfaceRef<IRenderNode, IRenderNode> >, dvacore::utility::SmallBlockAllocator::STLAllocator<ASL::InterfaceRef <IRenderNode, IRenderNode> > >::_M_erase(std::_Rb_tree_node<ASL::InterfaceRef<IRenderNode, IRenderNode> >*) + 54
16 libsystem_c.dylib 0x00007fff9067f307 __cxa_finalize + 200
17 libsystem_c.dylib 0x00007fff90680f57 exit + 15
18 com.adobe.AdobePremierePro 0x0000000100003623 start + 59