Thank you blutach for responding..

I shall check the MediaInfo output of the vob files (the ones with 0.99 GB in size) for the aspect ratio and let you know ASAP. But from my memory of watching both, I think the Aspect Ratio of both the disc's main video content are the same.

Regarding VMG, how should I check it and how exactly block it? I am sorry for asking this mundane question, but as i said I am rather very new in this software's use...

Thanks again...