I believe he has a foreign language movie with 430 subtitles spaced along the movie but when imported his PDS file did not get more tha 50-60% reporoduced in the loaded workspace.
He might try saving the original PD6 movie as a number of smaller AVI files and then make a new PD7 movie by appending each of the avi files to restore to the original
For future movies with so many subtitles it would be prudent to break the movie into sub-projects so each individual project has fewer numbers of subtitles.
A pragmatic approach, but it will work. The loading error may be the way the PDS is handled and I have noticed on PDS files greater than say 300KB and a small ram pc (VISTA with 1.5Gbytes) I have lost information so that may be a hint.
If you can't solve the problem - Change the problem