I can't reproduce it (Windows here).
I tried your steps: After the message "image file not found" I can select an 
other image and proceed normal.

Can somebody else reproduce it? Or it is a Mac specific issue?

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https://bugs.launchpad.net/bugs/1065780

Title:
  Hugin crashes on opening pto file (OS X)

Status in Hugin - Panorama Tools GUI:
  New

Bug description:
  
  Hugin crashes from time to time on opening a pto file. It seems to hapen more 
often when other programs are open in the background.
  The same pto file can open 10 times without a problem and then 4 times cause 
Hugin to crash.

  Hugin 2011.4.0 (Mac)
  OS X 10.6.8
  iMac7,1, Intel Core 2 Duo, 2.4 GHz, 4 GB
  Activity monitor: page-outs: 0 bytes, free memory 1.95 GB
  pto file with 2 or 4 TIFF images, 16 bit gray, 717 x 2706, 3.9 MB

  
  Exception Type:  EXC_CRASH (SIGABRT)
  Exception Codes: 0x0000000000000000, 0x0000000000000000
  Crashed Thread:  0  Dispatch queue: com.apple.main-thread

  Application Specific Information:
  abort() called

  Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
  0   libSystem.B.dylib                 0x922a4c5a __kill + 10
  1   libSystem.B.dylib                 0x922a4c4c kill$UNIX2003 + 32
  2   libSystem.B.dylib                 0x923375a5 raise + 26
  3   libSystem.B.dylib                 0x9234d6e4 abort + 93
  4   net.sourceforge.hugin.Hugin       0x001b877d celeste::SafeAbs(int) + 125
  5   net.sourceforge.hugin.Hugin       0x00039428 
boost::shared_ptr<HuginBase::ImageCache::Entry>::operator->() const + 56
  6   net.sourceforge.hugin.base_wx     0x011650a7 
HuginBase::ImageCache::postEvent(boost::shared_ptr<HuginBase::ImageCache::Request>,
 boost::shared_ptr<HuginBase::ImageCache::Entry>) + 183
  7   net.sourceforge.hugin.Hugin       0x0000fa95 
huginApp::relayImageLoaded(ImageReadyEvent&) + 85
  8   libwx_macu-2.8.0.7.0.dylib        0x005dbbb2 
wxEvtHandler::ProcessEventIfMatches(wxEventTableEntryBase const&, 
wxEvtHandler*, wxEvent&) + 114

  In Console:
  12-10-12 03:00:00     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  
MainFrame::RestoreLayoutOnNextResize()
  12-10-12 03:00:54     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  Number 
of images 4
  12-10-12 03:00:54     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  
ContractViolation: 
  12-10-12 03:00:54     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  
Precondition violation!
  12-10-12 03:00:54     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  Unable 
to open file ''.
  12-10-12 03:00:54     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  
(/Users/Shared/development/hugin_related/hugin-2011.4.0/mac/../src/foreign/vigra/vigra_impex/codecman:206)
  12-10-12 03:00:54     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  ERROR: 
03:00:54.104600 
(/Users/Shared/development/hugin_related/hugin-2011.4.0/mac/../src/hugin_base/huginapp/ImageCache.cpp:658)
 loadImageSafely(): Error during image reading: 
  12-10-12 03:00:54     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  
Precondition violation!
  12-10-12 03:00:54     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  Unable 
to open file ''.
  12-10-12 03:00:54     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  
(/Users/Shared/development/hugin_related/hugin-2011.4.0/mac/../src/foreign/vigra/vigra_impex/codecman:206)
  12-10-12 03:00:54     [0x0-0x90090].net.sourceforge.hugin.Hugin[958]  
/Users/Shared/development/hugin_related/ExternalPrograms/3way-repository/include/boost/smart_ptr/shared_ptr.hpp:418:
 failed assertion `px != 0'
  12-10-12 03:00:54     com.apple.launchd.peruser.502[100]      
([0x0-0x90090].net.sourceforge.hugin.Hugin[958]) Job appears to have crashed: 
Abort trap
  12-10-12 03:00:55     ReportCrash[966]        Saved crash report for 
Hugin[958] version 2011.4.0 (cf9be9344356) to 
/Users/Willeke/Library/Logs/DiagnosticReports/Hugin_2012-10-12-030055_imac-van-willeke.crash

  Also from Console, another attempt, didn't crash:
  12-10-12 01:24:45     [0x0-0x3a03a].net.sourceforge.hugin.Hugin[410]  ERROR: 
01:24:45.271502 
(/Users/Shared/development/hugin_related/hugin-2011.4.0/mac/../src/hugin_base/huginapp/ImageCache.cpp:934)
 loadSafely(): Please set 
HuginBase::ImageCache::getInstance().asyncLoadCompleteSignal to handle 
asynchronous image loads.

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