PrintMusic 2008 - playback distortion

So, when I have a large ensemble, especially with many different kinds of instruments, Finale seems to pick out one instrument and make it's sound go all haywire. Often there is crackling and loss of volume while this instrument is playing with other instruments. I've tried changing the patches and the Midi channel but the problem persists. It seems to be the placement of the instument more than anything that singles it out. None of the other instruments experience this problem, and it only happens when a significant amount of instruments are playing along with this one.

Could it be a problem with RAM? Have any of you even heard of this problem? I haven't seen it in any of the posts in this category.

Also, Finale seems to have a problem with ending notes. Instead of simply dieing down into silence as any reasonable player would, when a note ends in PrintMusic, there is one final burst of the note. So many notes that are held out for a couple of measures end in a very anticlimatic "burp". It's not as catastophic to the playback as the distortion is, but it's still very annoying, and makes many of the audio files exported from PrintMusic unusable.

Any Ideas?

-Fermion