CD burning problems with the MV 8000

[joshdriscollbeats]

I'm having a problem burning songs to a CD on my MV 8000. The MV isn't letting me put the last 4 tracks that were mastered on to a CD. When I go to the track and click execute to select the song to add it to the burn list it doesn't do anything also it won't let me play those 4. When I select the songs mastered before those 4 it lets me select those for the CD and listen to that song. I was curious if anyone has had this problem before with their machine.