Audio stops several seconds after play in-program

[RexnoStove]

I'm mixing a song in LPX using MIDI alone. I've been getting a repeating problem where several seconds after I hit the spacebar to preview what I've mixed, the audio cuts out. The playhead, however, keeps moving as if it were playing, and if I try to play the musical typing, the audio is still cut out. If I press play again, there's still no sound. After a while it lets me play it again, but the audio cuts out again shortly after. Otherwise, everything appears to be functional.

I'm used to getting the system overload since I'm running the program on a MacBook Air, but I've never had this problem before.

I tried rebooting and pasting all of the tracks into a new project, but it's still happening.

When I open up a completely separate project, it seems to work fine. Is it something wrong with the tracks?

If it helps, the last thing I did before it began having this problem was delete a few tracks from the beginning of the project.

[danyg]

observe your master fader when you press play. Does it move down?

[RexnoStove]

It doesn't appear to! I've checked, and the overall volume stays the same. I also attempted to bounce the project, and even the bounced mp3's audio cut out.

[triplets]

Try muting individual tracks and see if anything changes.

[RexnoStove]

That doesn't seem to help.

[danyg]

Can you send us the arr. ?