If the Viola is (in a separate voice because it is) silent and only there to provide an arco sound missing from your Cello, I'd check to make sure the arco is attached to the Cello and not mistakenly attached to the Viola.

I'm just glad I don't have to switch from pizz to arco as quickly as that passage suggests, especially eight times in a row. :-)

Thanks but yeah, it’s definotely attached to the cello and set to start at the beginning of the measure.

If you want arco to occur on the third eighth-note beat, should it be attached to the start of the measure?

No; sorry-I meant the pizz marking is set to start at the beginning of the measure. Here is the score for what it's worth (still fixing a lot of stuff since it was created in an older version of Finale). What is odd is the pizz marking in the cello in measure 96 works as desired; it's the going back to the beginning of 95 after the first iteration that messes that measure up. Thanks for looking into this. https://www.dropbox.com/s/r3jp67uso25cxza/two%20sets.musx?dl=0

I hate to be the bearer of bad new (or perhaps it is good news), but I went to measure 96 and solo'd the cello part. It played back exactly as indicated.

When I opened your file, the Aria instruments were empty, so I had the program Reassign Playback Sounds, which it did from the standard Finale Aria bank of sounds. Perhaps that made a difference, since you might have been using a different Garritan package.

Hmmm...I had reassigned sounds from GPO5 (since the original file used just MIDI sounds as that was all I had way back when-this was like Finale 3.5 or something like that). Interesting. Will check that out. Thanks.