I have the same Creative Muvo V100 player in the office and I also tried to sync the files and failed. I tried another book and it failed too. It's odd that you're able to sync other books and not Coda, because it uses the same drm license method. It will not sync for me, because I believe the Muvo V100 player doesn't support "Subscription" digital rights management. I tested the files with another Creative mp3 player (Zen V) and they synced perfectly, becuase the Zen V supports "Subscription" drm.
There is a link on the bottom left side of the Creative Support site that says "Plays for Sure" - Using Subscriptions Services? - Important Updates.
I couldn't get the link to work, but you may want to contact Creative about the important update or download the regular update for the device.
I can also suggest, as an alternative, that you burn the audio files to CD-RW discs and rip the audio back into the computer as un-protected mp3 files.
We'll try rendering a new Deathstalker Coda download to see if it has the same results. You can try downloading the Low Quality 96kbps version of Coda to see if that will work. The link is below the image download on the Coda product page: http://www.graphicaudio.net/audiobooks/zip/GADSC001L.zip
I posted a screenshot of the sync issue below:
