No one has replied
Sorry guys, the issue was that this particular unit had 2 hard drives, so selecting single disk was the issue.
All good now.
So I ended up building a new FOG server and this time everything worked as it should. Not sure what was causing the old server to act that way, but even after manually downloading and saving the new files, it still showed the old version.
Anyhow, thanks for your guidance with this.