Clips freezing (authored with DVD LAB)

[gsh]

I have 12 clips that I want to put on a compilation disc. They were ripped from 2 other DVDs, and I trimmed them and added titles and fades in MPEG Wizard, keeping the original parameters to maintain quality (no re-encoding).
I authored the disc in DVDLab 1.3 (not had any problems with it so far)with each clip as a title/movie.
On watching the disc, 7 of the clips will play for a second or two, then the player will jump to the next clip. One of the clips won't play at all. I initially thought it might be the slightly old DVDrw I was using, but re-burning with a new rw has the same problem.
I also tried joining 8 of the clips together, which meant re-encoding as some had different aspect ratios. The final movie is 704x480 and once burned plays fine with no skipping between chapters. The 4 clips that were left seperate are 720x480 and still play fine.
I have checked the bitrates of each clip, and the non playing clip is vbr peak of 8000, the other skipping clips vbr peak rate of 9534. All have mp2 audio @ 128. The 3 clips that play are vbr peak 7500.
What do I need to do to get all the clips to play? Change the bitrates or aspect ratios so they are all the same? I want to keep the quality as near to the original clips as possible. Strangely, 2 of the "good" clips came from the same disc as a number of the "bad" clips, so I thought they should all work.
Any advice will be greatly appreciated.

[Baldrick]

does it happen when you play with a software dvd player? or just your standalone dvd player? or both?

dvdlab is still a bit buggy, read the comments in the tool sections.

[gsh]

Thanks for replying.
It only happens on a standalone - WinDVD and PowerDVD play it no problem.
I went ahead and converted the problem clips to cbr 7500 with MPEG Wizard, and now everything plays just fine. I can't notice any difference in the quality, but the converted files are actually larger than the original files. Now the whole disc is at 3.7GB from 3.17 before (as reported in DVDLab). I still have 1GB of other clips to add, so I was hoping to keep the original filesizes. If There's no other way, I will have to lose a couple of clips.
I'm sure I have just missed something, but changing the bitrate of a file from vbr 9000+ peak to cbr 7500 shouldn't increase the size, should it? Should I have used vbr and capped at 7500 instead?
Sorry for all the questions, this has been driving me nuts for a couple of days.

[andkiich]

I'd try upgrading to the newest beta (16Rc4). there have been a lot of mods since 1.3.

[gsh]

oops -double post edit.