Hi CBZ,
I see a number of logs attached (Latest Logs.zip). Some of which are from automation, meaning the machine has rebooted into WinPE..
Instead, if the client does not re-boot and stays on "prepare for image capture", it could be because the sysprep re-arm count has been reached:
https://www-secure.symantec.com/connect/articles/how-sysprep-windows-vista-7-or-8-image-more-three-times
Is it only Windows 8.1 giving problems? Can you capture an image of Windows7 or any other OS?
Mauro