SetWidth() and SetHeight() in vtkActor2D causes a crash after a rendering call

I'm trying to overlay text on an image in vtk when a certain button is clicked. I use a vtkTextActor, vtkTextRepresentation, and vtkTextWidget to achieve this.

Here is my code:

// set up actor
textActor->SetInput(label.toStdString().c_str());
textActor->GetTextProperty()->SetColor(1.0, 0.0, 0.0);

// set location of widget
textRepresentation->GetPositionCoordinate()->SetCoordinateSystemToWorld();
textRepresentation->GetPositionCoordinate()->SetValue(200,200);

// set up widget
textWidget->SetInteractor(imageInteractor);
textWidget->SetRepresentation(textRepresentation);
textWidget->SetDefaultRenderer(rend);
textWidget->SetTextActor(textActor);
textWidget->SelectableOff();

// render widget
rend->GetRenderWindow()->Render();
textWidget->On();
textWidget->GetTextActor()->SetWidth(vc[0]);
textWidget->GetTextActor()->SetHeight(vc[1]);
rend->GetRenderWindow()->Render(); // crash

If I comment out the SetWidth and SetHeight function calls, the program works fine and the text widget pops up rather small. However when I try to adjust the width and height of textActor it crashes during the render call. Note that vc[0] and vc[1] are relative to the viewport coordinate system, I calculate them in a different function.

I can adjust the width and height of textActor BEFORE the textWidget->On() call, and the widget will still pop up, but it ignores my width and height changes. I cannot seem to change the box dimensions programatically. Am I doing something wrong or is this a vtk bug?

Here is an example. I'd like the text to appear bigger (changing the font size wont work, I think its because the actor itself is too small).

UPDATE I have not figured out why its crashing or how to fix it. As a workaround, I've been adjusting the Position2Coordinate value in my textRepresentation. The rendering call seems to be readjusting my set values. Can anyone explain why or how to fix this?

I'm not sure what's causing the crash, but I found a workaround. By using textRepresentation->SetPosition(x1,x2) and textRepresentation->SetPosition2(width,height), I'm able to control the location and size of the widget. Its important to note that SetPosition2() is relative to SetPosition() meaning instead of a coordinate, the second position should be thought of a width and height. All of my values are in the Normalized Viewport coordinate system.