Mardy,
The original issue you were running into is due to the client machine not being set to boot to pxe by default in the bios. When this is not set it will continuously boot to the production environment and then error out after a few attempts.
Second issue... I have never seen this error but... Ghost runs into spanning issues due to one of two scenarios. If the image file is corrupted/renamed or a lack of priveledges when accessing the image file location. I would suggest creating a new forum post for this issue.