Exception upon close in Windows 7

What steps will reproduce the problem?
1. Run application on Windows
2. Do some things
3. Close the application and recieve an exception

What is the expected output? What do you see instead?
Close quietly

What version of the product are you using? On what operating system?
On Windows7

Please provide any additional information below.

Problem signature:
  Problem Event Name:   APPCRASH
  Application Name: HeeksCAD.exe
  Application Version:  0.0.0.0
  Application Timestamp:    4c58fe70
  Fault Module Name:    StackHash_0a9e
  Fault Module Version: 0.0.0.0
  Fault Module Timestamp:   00000000
  Exception Code:   c0000005
  Exception Offset: 002e50f7
  OS Version:   6.1.7600.2.0.0.256.1
  Locale ID:    1033
  Additional Information 1: 0a9e
  Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
  Additional Information 3: 0a9e
  Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

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Original issue reported on code.google.com by kookh...@gmail.com on 6 Aug 2010 at 11:01

nav111 / heekscnc

Exception upon close in Windows 7 #237