Can no longer preview background audio accurately, efficiently in Captivate 7

Question

I'm currently using Captivate 7.0.1.237 on a Mac running OS X Yosemite 10.10.1.
As far as I know, Captivate has never allowed for Background audio previews to work anywhere but in (Preview > Project) and (Preview > web [or] HTML5). Those aren't ideal, but I used to have no problem fast-forwarding the preview to see what adjustments needed to be made to sync background audio voiceovers to slide content. (FYI - I can't record to each slide because I'm combining recordings with static slides. Tried, failed.)
Since upgrading to Yosemite, I have been unable to scrub (rewind/fast forward) in any of the preview modes without losing the synchronization of the voiceover audio I have in the background. Previewing in web browsers doesn't even work at all any more. {Error: This webpage is not available.} The video will rewind/fast forward, but the audio doesn't recognize the timestamp.
So, this means that now the only method I have for timing audio to video is previewing the entire project (Preview > Project). I am working on developing a set of 15 different videos (eventually MP4 output, so no interactions), each of which is between 3-8 minutes in length. Each project is between 25-60 slides. Say I create content on the last slide (which might be 5-10 objects per slide,) I have to preview the entire 8-minute video without pausing, rewinding, or fast-forwarding - every. single. time. I add. or change. some content.
This problem has led to me working 10+ hours in a day attempting to sync audio to animations for just one project. This is totally unacceptable.
PLEASE HELP!!! I've searched high and low through the documentation, FAQs, and message boards and I'm coming up empty.

Answer 1

Thanks for considering the problem! Unfortunately, as I stated above, the voiceover needs to be a background audio file that plays throughout the project. It's not possible to record audio-per-slide because of the structure of the video - and because I do a lot of editing of the audio files for 8-minute videos.
FYI - I was able to have a chat conversation with a support tech. Here is the transcript of that chat:
Anvinder: We have not tested the workflow of captivate 7 with yosemite so far.
Anvinder: You might find some inconsistencies.
AMANDA: So, is there no solution to this error?
AMANDA: Do I need to publish the entire project every single time I make a small change?
AMANDA: Has Captivate 8 shown this error in Yosemite?
Anvinder: In order to make the changes evident in the output  you need to publish the whole output.
Anvinder: Amanda, the best practice is to publish the whole project.We are in testing phase for the same. You can download the trial version of captivate 8 and work on it on yosemite.
If you have a suggestion for a better workflow for creating tutorial videos (ultimately published to YouTube) that need to include the following, please share!
a voiceover
heavily animated explanations of concepts
live screen capture of business processes in software
Thanks!