When I added chapter points to my SVCD they were all about 30secs out when I played the disc in my standalone.
The culprit was a 30sec Dolby Digital intro that I had in front of the main movie. The player included this intro in the total program time thus affecting where the chapters were.
I fixed by putting the intro an the end of the disc but having the disc jump to it first then going to the start of the disc for the movie.