RaiseTextureChanged does not invalidate widget's visual causing invalid texture coordinates. This happens in pair with async texture loading when GetTextureInfo at first returns the size of a small stub texture and when the texture is fully loaded, calls RaiseTextureChanged which in its turn calls GetTextureInfo again that returns the correct size. The bug itself forces the renderer to draw only a tiny portion of the image. The bug can be somewhat fixed by manual visual invalidation of the entire visual tree like so:

eastl::vector<Noesis::Visual*> stack;
stack.push_back(it->root);
while (!stack.empty())
{
    auto widget = stack.back();
    stack.pop_back();
    if (auto elem = Noesis::DynamicCast<Noesis::FrameworkElement*>(widget))
    {
        elem->InvalidateVisual();
    }

    for (int i = 0; i < Noesis::VisualTreeHelper::GetChildrenCount(widget); ++i)
    {
        stack.push_back(Noesis::VisualTreeHelper::GetChild(widget, i));
    }
}

More information here: https://www.noesisengine.com/forums/viewtopic.php?p=18683