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[tmodes <1682974@xxxxxxxxxxxxxxxxxx>]

I can't reproduce the issue on Fedora. 
Trying a blind fix in changeset 282b5e7ba8f0. This breaks at least for me nothing.

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https://bugs.launchpad.net/bugs/1682974

Title:
  hugin won't start: "invalid window dc"

Status in Hugin:
  New

Bug description:
  Hi -- Kubuntu 16.10, added the nightly repo which appears to have last
  been updated 2017-04-10 (2016.3.0.84a397fa5e9a).

  Running hugin, I see a splash screen and an immediate failed
  assertion:

  ASSERT INFO:
  ../src/gtk/dcclient.cpp(1520): assert "IsOk()" failed in Clear(): invalid window dc

  BACKTRACE:
  [1] wxWindowDCImpl::Clear()
  [2] ImagesTreeCtrl::SetOptimizerMode()
  [3] OptimizePanel::Init(HuginBase::Panorama*)
  [4] MainFrame::MainFrame(wxWindow*, HuginBase::Panorama&)
  [5] huginApp::OnInit()
  [6] wxEntry(int&, wchar_t**)
  [7] main
  [8] __libc_start_main
  [9] _start

  If I click "Continue" many times, the program appears to start and
  work (though I haven't fully tested.)

  System info:

  Operating System: Linux 4.8.0-46-generic x86_64
  Architecture: 64 bit
  Free memory: 5107772 kiB

  Hugin
  Version: 2016.3.0.84a397fa5e9a
  Path to resources: /usr/share/hugin/xrc/
  Path to data: /usr/share/hugin/data/
  Hugins camera and lens database: /home/casey/.hugindata/camlens.db
  Multi-threading using C++11 std::thread and OpenMP

  Libraries
  wxWidgets: wxWidgets 3.0.2
  wxWidgets Library (wxGTK port)
  Version 3.0.2 (Unicode: wchar_t, debug level: 1),
  Runtime version of toolkit used is 2.24.
  Compile-time GTK+ version is 2.24.30.

  libpano13: 2.9.19 
  Boost: 1.61.0
  Exiv2: 0.25
  SQLite3: 3.14.1
  Vigra: 1.11.0
  LittleCMS2: 2.7

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