OK, here is the deal.
I got an NTSC DVD with 3 subtitles and i want to change one of them to another language. So I set up my "new" subtitle and uses vobedit to Demultiplex the audio and Video files. Then Im using ifoedit to author a the new dvob with my custom sub. The problem is that the celltimes get all screwed up, the original vob is 213739 frames (running-time about 2 hours) but then my authored vobs will only be 174352 frames (RT about 1H 35 min)
But the whole moive is there

So the last cells dont get there, original 30 new only 25.

Guess this is an issue with NTSC Film material. DVD2AVI states it as 29.976 frames FILM

I need to get proper cells to get everything to work with the meny and chapterselection.

Any suggestions?