Okay, this is getting stranger.
Yes, the tracks are making it to the disc, 100% sure. I've played them off the player after the disc has been ejected and reinserted and the unit turned off and turned back on.
But get this: I was fiddling with it a bit more tonight, and I can now burn as many tracks as I want to a single MD if I do the following: add a single track to the SonicStage library, burn it, then delete it from the SonicStage library, then do the same thing with each individual track.
If I try to do multiple tracks at once, only the first 3 tracks will burn.
Weird, huh? Thoughts?