playing VOB files with subtitles

[luddie]

Hi,
I'm thinking about buying Mezzmo, but before I do that I want to solve ths issue I'm having.
I have a Panasonic Viera plasma, and I can play divx files with srt subtitles using mezzmo, without problems.
However, I have two problems with VOB files:
- I can play the individual VOB files on the television, but not the entire movie at once
- I can't see or choose the subtitles
Any idea what I'm doing wrong?
Thanks,
L