Changes to audio not being saved

I'm importing existing Articulate courses into Storyline so we can publish them in an iPad-friendly format.

Anyhow, I have this one course where the builds and animations in a certain section just seemed to overwhelm Storyline when I imported it (I blame the original source material, not Storyline), and it seemed to me to be simpler to break the slide into multiple slides, and then just modify a few of the builds (it was a very messy, complicated slide).

Anyhow, as part of that, I've also had to break up the original slide's audio into chunks that correspond to the newly subdivided sections.

To do that, I'm double-clicking the sound in the slde, and then selecting blocks of it to lop off (in the first slide, all the audio that follows the narration that corresponds to the first slde, in the middle slide, all the audio that precedes and follows the middle slide, and, in the last slide, all the audio that precedes the last slide).

Anyhow, after cutting out the audio, I close the audio editor and click "Yes" when Storyline asks me if I want to save. And, as long as I stay in that slide, it appears that Storyline has saved my sound file edits. However, when I go to preview the slide, the audio portion goes back to the original, full-length audio.

Anyone else experience this? If so, what did you do?

It's making me a little crazy.

Thanks.