[vtkusers] App crashes unless compiled with debug config (Windows)

[Oliver Cairncross]

Hi,

vtk 7, msvc 14, windows 10

I've had this problem before and thought it was something bad in my tool
chain. But I've rebuild everything from scratch and it's still a problem.

If I do something simple like

string s1 = sourceFiles->GetFileNames()->GetValue(i);

it runs fine in debug mode. When I compile in RelwithDebInfo it crashes
with a bad allocation.
When I have a look at the object the there is garbage where the string is
supposed to be. As if it hasn't been initialised. I am calling an
 sourceFiles->Update() beforehand.

Interestingly if I do

cout << sourceFiles->GetFileNames()->GetValue(i);
string s1 = sourceFiles->GetFileNames()->GetValue(i);

it will print to console and then crash on the next line.

Is anyone else having this problem?

Cheers
ollie
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