Hi jojorender,
thanks for notifying us. There has been a change in how the regions work recently, causing this bug. We'll fix the issue, but it will mean that it can happen that you load a document and when you start rendering it, only a part (region) of the image will be rendered. But if you use C4D PV instead of VFB, you won't see the active render region, which might confuse you. Do you (or anyone else for that matter) think that this is acceptable? Or will it not be confusing at all? We might change the rendering status text to something like "Rendering render region pass 2/100", would that make sense?