savefig problem (software rendering issue)

Hello again!
This issue is about software rendering too.
On some machines without 3D acceleration (or with minor OpenGL support i.e. on Intel integrated cards) mlab's savefig function crashes the entire application somewhere inside vtk dll.
This issue applies to vtk 5.2, 5.4, and 5.6.

I'll try to run it under debugger and retrive the callstack in DLL libraries later.

Update: forgot to mention that I'm using it with offscreen rendering enabled.