I was working on a composition yesterday and last night and was just getting basic un-pitched percussion parts laid out. However when I opened the file this morning none of the un-pitched percussion playback would work correctly. I have four staves at the bottom of my score with a metal combo, rack A, rack B, and a Bass/Tamtam. I realize that the staff styles, audio units instruments, and instrument list must all match, and to my knowledge this is all correct. But I've yet to figure out the problem. Any guesses?

Mason,
    Running Finale 2011 with VDL 2.5 on my Macbook Pro

Can you post a sample file that shows this?