can't solve crash on Mac/Win (32 and 64)

Question

I have a non-interactive, infinitely cycling application that crashes regularly (if not frequently). I believe it's happening when certain objects are in the scene, but I'm not sure. The Mac Crash Reporter says it's this error, which I understand has to do with memory, but I'm not exactly sure what else:

 Crashed Thread:        0  Dispatch queue: com.apple.main-thread
 
 Exception Type:        EXC_BAD_ACCESS (SIGABRT)
 Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000230
 Exception Note:        EXC_CORPSE_NOTIFY

The logs in the development builds are ending with something like the following.

 Receiving unhandled NULL exception
 Receiving unhandled NULL exception
 Obtained 13 stack frames.
 Obtained 31 stack frames.
 #0  0x000000016a0db9 in void physx::shdfnd::sort<physx::PxsContactPatch*, physx::SortBoundsPredicateManifold, physx::shdfnd::ReflectionAllocator<physx::PxsContactPatch*> >(physx::PxsContactPatch**, unsigned int, physx::SortBoundsPredicateManifold const&, physx::shdfnd::ReflectionAllocator<physx::PxsContactPatch*> const&, unsigned int)
 #1  0x000000016a0120 in physx::PxsContactReduction<6u>::reduceContacts()
 #2  0x0000000169f8d2 in physx::PxsSolverConstraintPostProcessTask::mergeContacts(physx::PxsCompoundContactManager&, physx::PxsThreadContext&)
 #3  0x0000000169f342 in physx::PxsSolverConstraintPostProcessTask::runInternal()
 #4  0x00000001630804 in physx::Cm::Task::run()
 #5  0x0000000071e9fc in PhysxJobFunc(physx::PxBaseTask*)
 #6  0x00000000a1f506 in JobQueue::Exec(JobInfo*, int, int)
 #7  0x00000000a1fa10 in JobQueue::ExecuteOneJob()
 #8  0x00000000a1bacc in JobSystem::ExecuteOneJobQueueJob()
 #9  0x000000006ec245 in CompletionTask::ProcessAllPhysicsTasks()
 #10 0x0000000070de3d in PhysicsManager::FixedUpdate()
 #11 0x0000000070ba53 in PhysicsManager::InitializeClass()::FixedUpdatePhysicsFixedUpdatestruct::Forward()
 #12 0x00000000acb33d in PlayerLoop()
 #13 0x0000000133c126 in -[PlayerAppDelegate UpdatePlayer]
 #14 0x00000095a8f1e6 in __NSFireTimer
 #15 0x0000009426a996 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__
 #16 0x0000009426a4ad in __CFRunLoopDoTimer
 #17 0x00000094269f4e in __CFRunLoopDoTimers
 #18 0x00000094261910 in __CFRunLoopRun
 #19 0x00000094260e1a in CFRunLoopRunSpecific
 #20 0x00000094260c0b in CFRunLoopRunInMode
 #21 0x00000093954396 in RunCurrentEventLoopInMode
 #22 0x00000093954182 in ReceiveNextEventCommon
 #23 0x00000093953f7b in _BlockUntilNextEventMatchingListInModeWithFilter
 #24 0x00000091f86015 in _DPSNextEvent
 #25 0x000000926ebbbb in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]
 #26 0x000000926eb4e5 in -[NSApplication(NSEvent) nextEventMatchingMask:untilDate:inMode:dequeue:]
 #27 0x00000091f7acb6 in -[NSApplication run]
 #28 0x00000091f47d1e in NSApplicationMain
 #29 0x0000000133bf1b in PlayerMain(int, char const**)
 #30 0x000000000029f5 in start
 Thread 0x0 may have been prematurely finalized
 Stacktrace:
 
 
 Native stacktrace:
 
     0   libsystem_kernel.dylib              0xa1668496 __pthread_kill + 10
     1   libsystem_c.dylib                   0xa15c8a34 abort + 141
     2   io 120817 ELtestbuild32 nobreak DEV 0x0112b129 _Z12HandleSignaliP9__siginfoPv + 41
     3   libmono.0.dylib                     0x030a4fbc mono_chain_signal + 69
     4   libmono.0.dylib                     0x02ffdc08 mono_sigsegv_signal_handler + 231
     5   libsystem_platform.dylib            0xa1742e5b _sigtramp + 43
     6   ???                                 0xffffffff 0x0 + 4294967295
     7   io 120817 ELtestbuild32 nobreak DEV 0x016a0120 _ZN5physx19PxsContactReductionILj6EE14reduceContactsEv + 1296
     8   io 120817 ELtestbuild32 nobreak DEV 0x0169f8d2 _ZN5physx34PxsSolverConstraintPostProcessTask13mergeContactsERNS_25PxsCompoundContactManagerERNS_16PxsThreadContextE + 1378
     9   io 120817 ELtestbuild32 nobreak DEV 0x0169f342 _ZN5physx34PxsSolverConstraintPostProcessTask11runInternalEv + 290
     10  io 120817 ELtestbuild32 nobreak DEV 0x01630804 _ZN5physx2Cm4Task3runEv + 36
     11  io 120817 ELtestbuild32 nobreak DEV 0x0071e9fc _ZL12PhysxJobFuncPN5physx10PxBaseTaskE + 204
     12  io 120817 ELtestbuild32 nobreak DEV 0x00a1f506 _ZN8JobQueue4ExecEP7JobInfoii + 118
     13  io 120817 ELtestbuild32 nobreak DEV 0x00a1fa10 _ZN8JobQueue13ExecuteOneJobEv + 64
     14  io 120817 ELtestbuild32 nobreak DEV 0x00a1bacc _ZN9JobSystem21ExecuteOneJobQueueJobEv + 28
     15  io 120817 ELtestbuild32 nobreak DEV 0x006ec245 _ZN14CompletionTask22ProcessAllPhysicsTasksEv + 21
     16  io 120817 ELtestbuild32 nobreak DEV 0x0070de3d _ZN14PhysicsManager11FixedUpdateEv + 3005
     17  io 120817 ELtestbuild32 nobreak DEV 0x0070ba53 _ZZN14PhysicsManager15InitializeClassEvEN35FixedUpdatePhysicsFixedUpdatestruct7ForwardEv + 35
     18  io 120817 ELtestbuild32 nobreak DEV 0x00acb33d _Z10PlayerLoopv + 605
     19  io 120817 ELtestbuild32 nobreak DEV 0x0133c126 -[PlayerAppDelegate UpdatePlayer] + 326
     20  Foundation                          0x95a8f1e6 __NSFireTimer + 97
     21  CoreFoundation                      0x9426a996 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 22
     22  CoreFoundation                      0x9426a4ad __CFRunLoopDoTimer + 1213
     23  CoreFoundation                      0x94269f4e __CFRunLoopDoTimers + 350
     24  CoreFoundation                      0x94261910 __CFRunLoopRun + 2192
     25  CoreFoundation                      0x94260e1a CFRunLoopRunSpecific + 506
     26  CoreFoundation                      0x94260c0b CFRunLoopRunInMode + 123
     27  HIToolbox                           0x93954396 RunCurrentEventLoopInMode + 268
     28  HIToolbox                           0x93954182 ReceiveNextEventCommon + 494
     29  HIToolbox                           0x93953f7b _BlockUntilNextEventMatchingListInModeWithFilter + 83
     30  AppKit                              0x91f86015 _DPSNextEvent + 1227
     31  AppKit                              0x926ebbbb -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1742
     32  AppKit                              0x926eb4e5 -[NSApplication(NSEvent) nextEventMatchingMask:untilDate:inMode:dequeue:] + 132
     33  AppKit                              0x91f7acb6 -[NSApplication run] + 943
     34  AppKit                              0x91f47d1e NSApplicationMain + 1368
     35  io 120817 ELtestbuild32 nobreak DEV 0x0133bf1b _Z10PlayerMainiPPKc + 1371
     36  io 120817 ELtestbuild32 nobreak DEV 0x000029f5 start + 53
 
 Debug info from gdb:
 
 
 =================================================================
 Got a SIGABRT while executing native code. This usually indicates
 a fatal error in the mono runtime or one of the native libraries 
 used by your application.
 =================================================================

If anyone can help interpret these lines I'd be extremely grateful. Sometimes there are 4 and even 8 "Receiving unhandled NULL exception" lines.

I've used PlayMaker to script some pretty heavy physics interactions. The memory logs have generally shown total memory usage at around 250-300 MB. I'm not really sure what else to do at this point. Hoping someone can provide insight!

can't solve crash on Mac/Win (32 and 64)

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