[MacDV] DVD probs

[Robert & Susan Lloyd]

I'm feeling singularly stupid.  I cannot seem to make a DVD from FCE 
HD.  It's a fifteen minute movie made with non-HD tape from a non-HD 
camcorder on a G4 Dual, Pioneer 105 disc burner.  I have exported to 
Quicktime movie (choosing audio and video), selected Make Movie 
Self-contained.  This produces a file called a Final Cut Express movie 
file.   I have imported that file into iDVD, burned the DVD, and when I 
put the resulting disc into my commercial dvd player, it tells me the 
disc is defective, or dirty, and just won't play.  I've increased the 
length of the movie to 35 minutes (adding slugs) because I have a memory 
that a too short movie won't make a dvd, but this has made no 
difference.  I have exported the movie using Quicktime Conversion to 
make a Quicktime movie (.mov), with the same result.  Any suggestions?  
The fun has gone out of making coasters.

Is there something about the HD part of the program that is messing me 
up?  I got FCE HD thinking I might get into HD down the road.

tia.

BobLL