30-45 Second Black picture appears on screen between Video Clips..

Hi, I recently made a DVD disc with about 30 Music clips with a music menu on it. I'm very happy with the end result but there is one slight problem. Sometimes at the end of a video clip before it goes onto the next one there is a 30-45 second pitch black picture that appears on the screen. What could be causing this or what is it ??
Any ideas.
Thanks.

Hi ChrissyBoy, when i add the video clips i make a new VTS for each clip.
So if i had 30 clips then i have 30 VTS. Should i just put the 30 in one VTS?
Thanks

...but if they have wildly different properties then you may have some problems.

Hey Chris, when you say wildly different properties, does this refer to the fact that i am mixing both Ntsc and Pal SVCD clips together on the one DVD, thus causing the problem?

Yes i am using the play all button, so it doesn't go back to the menu after each video. I'll have to play it in my PC like you said and see if it still happens.[/quote]