Crash in Win7 after choosing .raw file

This issue begins in v1.1.6. mlrawviewer.exe runs, allowing user to choose a video file. Once the file is chosen, program crashes. See log entries for v1.1.6 and v1.2.3:

* MlRawViewer v1.1.6
(c) Andrew Baldwin & contributors 2013-2014
Using GLFW
args: ['C:\\Users\\Dave\\AppData\\Local\\Temp\\_MEI94642\\dialogs.exe', 'openFilename', u'K:/RAWvideo']
kwargs: {'startupinfo': <subprocess.STARTUPINFO instance at 0x04FDCCD8>, 'stdin': -1, 'stderr': -2, 'stdout': -1}
<subprocess.Popen object at 0x04FE09D0>
result K:/RAWvideo/M14-1555.RAW
wavnames []
wavfilename K:/RAWvideo/M14-1555.WAV
Traceback (most recent call last):
  File "c:\Projects\mlrawviewer\build\mlrawviewer_win\out00-PYZ.pyz\GLComputeGLFW", line 304, in __draw
  File "<string>", line 887, in onDraw
  File "<string>", line 870, in init
  File "<string>", line 252, in __init__
  File "<string>", line 112, in __init__
  File "c:\Projects\mlrawviewer\build\mlrawviewer_win\out00-PYZ.pyz\ShaderPreprocess", line 177, in __init__
  File "c:\Projects\mlrawviewer\build\mlrawviewer_win\out00-PYZ.pyz\GLCompute", line 74, in __init__
  File "c:\Projects\mlrawviewer\build\mlrawviewer_win\out00-PYZ.pyz\OpenGL.GL.shaders", line 196, in compileProgram
  File "c:\Projects\mlrawviewer\build\mlrawviewer_win\out00-PYZ.pyz\OpenGL.GL.shaders", line 108, in check_validate
RuntimeError: Validation failure (0): 
Traceback (most recent call last):
  File "<string>", line 1874, in <module>
  File "<string>", line 1868, in main
  File "c:\Projects\mlrawviewer\build\mlrawviewer_win\out00-PYZ.pyz\GLComputeGLFW", line 247, in run
  File "c:\Projects\mlrawviewer\build\mlrawviewer_win\out00-PYZ.pyz\GLComputeGLFW", line 336, in __idle
  File "<string>", line 1194, in onIdle
AttributeError: 'NoneType' object has no attribute 'isDirty'

here is the log for the later version:

MlRawViewer v1.2.3
(c) Andrew Baldwin & contributors 2013-2014
Using GLFW
Traceback (most recent call last):
  File "c:\Projects\MRV\build\mlrawviewer_win\out00-PYZ.pyz\GLComputeGLFW", line 304, in __draw
  File "<string>", line 1100, in onDraw
  File "<string>", line 1083, in init
  File "<string>", line 337, in __init__
  File "<string>", line 145, in __init__
  File "c:\Projects\MRV\build\mlrawviewer_win\out00-PYZ.pyz\ShaderPreprocess", line 177, in __init__
  File "c:\Projects\MRV\build\mlrawviewer_win\out00-PYZ.pyz\GLCompute", line 92, in __init__
  File "c:\Projects\MRV\build\mlrawviewer_win\out00-PYZ.pyz\OpenGL.latebind", line 61, in __call__
  File "c:\Projects\MRV\build\mlrawviewer_win\out00-PYZ.pyz\OpenGL.GL.VERSION.GL_2_0", line 230, in glGetAttribLocation
  File "c:\Projects\MRV\build\mlrawviewer_win\out00-PYZ.pyz\OpenGL.error", line 208, in glCheckError
GLError: GLError(
    err = 1282,
    description = 'invalid operation',
    baseOperation = glGetAttribLocation,
    cArguments = (6, 'vertex\x00'),
    result = -1
)
Traceback (most recent call last):
  File "<string>", line 2306, in <module>
  File "<string>", line 2300, in main
  File "c:\Projects\MRV\build\mlrawviewer_win\out00-PYZ.pyz\GLComputeGLFW", line 247, in run
  File "c:\Projects\MRV\build\mlrawviewer_win\out00-PYZ.pyz\GLComputeGLFW", line 336, in __idle
  File "<string>", line 1560, in onIdle
AttributeError: 'NoneType' object has no attribute 'isDirty'

This is on a Win7 machine with Intel HD Graphics 4000 (driver version 10.18.10.3496). Versions prior to v1.1.6 ran fine (both precompiled binaries from developer and built on the machine in question.

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