[vtkusers] crash when unloading vtk

[Christian Kohler]

Hello!
I currently encounter a problem using the vtk library in our open source 
project "itom" (https://bitbucket.org/itom/itom/wiki/Home). The problem 
occurs when unloading a qt-plugin relying on the vtk library. The actual 
crash occurs in the function
vtkCommonInformationKeyManager::ClassFinalize() in the file 
vtkCommonInformationKeyManager.cxx (Line 76ff) when deleting the entries 
of the vtkCommonInformationKeyManagerkeys (Line 86) starting from the 
(in my case sixth) entry in the list named "LABEL" onwards (i.e. also 
skipping the deleting of this entry pulling to another one after that one).
I am using Vtk Version 6.3 from the downloadable zip file, self compiled 
with MsVS 2013 Express, CMake 3.2.3, qt and pyhton options disabled, all 
64bit version.
Any help is appreciated.
Best regards
Christian