Hang on Quit

Just cleaning tickets for large attachments. This is the important part of the crash log originally attached:

Date/Time:       2016-11-25 01:19:54 -0500  
OS Version:      Mac OS X 10.11.6 (Build 15G1004)  
Architecture:    x86_64  
Report Version:  22

Command:         MailMate  
Path:            /Applications/RFU/MailMate.app/Contents/MacOS/MailMate  
Version:         1.9.6 (5307)  
Parent:          launchd [1]  
PID:             78623

Event:           hang  
Duration:        6.29s (process was unresponsive for 66 seconds before sampling)  
Steps:           63 (100ms sampling interval)

Hardware model:  MacBookPro8,3  
Active cpus:     8

Fan speed:       2001 rpm

--------------------------------------------------
Timeline format: stacks are sorted chronologically  
Use -i and -heavy to re-report with count sorting  
--------------------------------------------------

Heaviest stack for the main thread of the target process:  
  63  start + 52 (MailMate + 9012) [0x10ff1b334]
  63  main + 570 (MailMate + 123701) [0x10ff37335]
  63  NSApplicationMain + 1176 (AppKit + 25448) [0x7fff8a5ce368]
  63  -[NSApplication run] + 682 (AppKit + 249216) [0x7fff8a604d80]
  63  -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 454 (AppKit + 295462) [0x7fff8a610226]
  63  _DPSNextEvent + 1067 (AppKit + 298486) [0x7fff8a610df6]
  63  _BlockUntilNextEventMatchingListInModeWithFilter + 71 (HIToolbox + 198063) [0x7fff90b285af]
  63  ReceiveNextEventCommon + 184 (HIToolbox + 198263) [0x7fff90b28677]
  63  RunCurrentEventLoopInMode + 235 (HIToolbox + 198965) [0x7fff90b28935]
  63  CFRunLoopRunSpecific + 296 (CoreFoundation + 560856) [0x7fff8297eed8]
  63  __CFRunLoopRun + 910 (CoreFoundation + 562382) [0x7fff8297f4ce]
  63  __CFRunLoopDoBlocks + 341 (CoreFoundation + 564485) [0x7fff8297fd05]
  63  __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12 (CoreFoundation + 697516) [0x7fff829a04ac]
  63  __52-[NSApplication(NSAppleEventHandling) _handleAEQuit]_block_invoke + 46 (AppKit + 4670441) [0x7fff8aa3c3e9]
  63  -[NSApplication _terminateFromSender:askIfShouldTerminate:saveWindows:] + 240 (AppKit + 4670802) [0x7fff8aa3c552]
  63  -[NSApplication terminate:] + 1930 (AppKit + 2484989) [0x7fff8a826afd]
  63  exit + 55 (libsystem_c.dylib + 391015) [0x7fff980fb767]
  63  __cxa_finalize_ranges + 345 (libsystem_c.dylib + 390243) [0x7fff980fb463]
  63  ??? (<A7A252DC-B0D1-3455-89AB-AF537CE55689> + 13948) [0x1101b367c]
  63  __semwait_signal + 10 (libsystem_kernel.dylib + 94474) [0x7fff91a7710a]
 *63  semaphore_wait_continue + 0 (kernel + 1029568) [0xffffff80002fb5c0]


Process:         MailMate [78623]  
Path:            /Applications/RFU/MailMate.app/Contents/MacOS/MailMate  
Architecture:    x86_64  
Parent:          launchd [1]  
UID:             501  
Task size:       104213 pages  
Note:            Unresponsive for 66 seconds before sampling

  Thread 0x7e8ac1         DispatchQueue 1         63 samples (1-63)       priority 47 (base 47)
  <process frontmost, thread QoS user interactive (requested user interactive), process unclamped, process received importance donation from CommandQ [567], process received importance donation from WindowServer [245], IO policy important>
  63  start + 52 (MailMate + 9012) [0x10ff1b334] 1-63
    63  main + 570 (MailMate + 123701) [0x10ff37335] 1-63
      63  NSApplicationMain + 1176 (AppKit + 25448) [0x7fff8a5ce368] 1-63
        63  -[NSApplication run] + 682 (AppKit + 249216) [0x7fff8a604d80] 1-63
          63  -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 454 (AppKit + 295462) [0x7fff8a610226] 1-63
            63  _DPSNextEvent + 1067 (AppKit + 298486) [0x7fff8a610df6] 1-63
              63  _BlockUntilNextEventMatchingListInModeWithFilter + 71 (HIToolbox + 198063) [0x7fff90b285af] 1-63
                63  ReceiveNextEventCommon + 184 (HIToolbox + 198263) [0x7fff90b28677] 1-63
                  63  RunCurrentEventLoopInMode + 235 (HIToolbox + 198965) [0x7fff90b28935] 1-63
                    63  CFRunLoopRunSpecific + 296 (CoreFoundation + 560856) [0x7fff8297eed8] 1-63
                      63  __CFRunLoopRun + 910 (CoreFoundation + 562382) [0x7fff8297f4ce] 1-63
                        63  __CFRunLoopDoBlocks + 341 (CoreFoundation + 564485) [0x7fff8297fd05] 1-63
                          63  __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12 (CoreFoundation + 697516) [0x7fff829a04ac] 1-63
                            63  __52-[NSApplication(NSAppleEventHandling) _handleAEQuit]_block_invoke + 46 (AppKit + 4670441) [0x7fff8aa3c3e9] 1-63
                              63  -[NSApplication _terminateFromSender:askIfShouldTerminate:saveWindows:] + 240 (AppKit + 4670802) [0x7fff8aa3c552] 1-63
                                63  -[NSApplication terminate:] + 1930 (AppKit + 2484989) [0x7fff8a826afd] 1-63
                                  63  exit + 55 (libsystem_c.dylib + 391015) [0x7fff980fb767] 1-63
                                    63  __cxa_finalize_ranges + 345 (libsystem_c.dylib + 390243) [0x7fff980fb463] 1-63
                                      63  ??? (<A7A252DC-B0D1-3455-89AB-AF537CE55689> + 13948) [0x1101b367c] 1-63
                                        63  __semwait_signal + 10 (libsystem_kernel.dylib + 94474) [0x7fff91a7710a] 1-63
                                         *63  semaphore_wait_continue + 0 (kernel + 1029568) [0xffffff80002fb5c0] 1-63