I noted that my initial post appears a bit confusing.

I ONLY have this problem with Undefined subtitles when I convert to AVI/DVIX files.
When I back up a dvd to a regular DVD format, I have no problems.
I ONLY experience this problem when I want to rip the series/movie as an AVI file so that I can cut down on the space it takes on my harddrive.
I noted that my inital post lists the subtitles as "unknown", however the actual word used by DVDfab is, "UNDEFINED".
Also, I noted that DVDShrink also lists the subs as "Unspecified".

Thanks...it's amazing that this has never been encountered before by anyone or maybe it's just my computer. Either way, I guess this is one that will never have a resolution.
Oh well.....

What really irritated me was that I had converted one of my new series to avi. So after converting all 7 discs, and watching the series, I came to find that the third disc into the series had "Unspecified" subs, so ONLY these eps did not have English subs and I had to re rip these three eps as a DVD file......what a waste of time and energy....I reinserted the dvd's and I noted that out of the 7 total discs, only one had "Undefined" listed for the subtitles. That's what I get for trusting DVDfab to work...