Imaging a newly created predefined computer will fail and the history of running the job disappears. This is related to having AD Import active, which creates a duplicate record of the machine, but picks the ad import record instead of the predefined record you created. The attached Point fix will fix this issue and allow the Predefined computer to be the primary record during this process. So your able to image the machine through the whole Job and not just a portion of it.
To fix your environment you will need to install the attached point fix on your Notification Server. This will add in an additional Key to the predefined computer to allow the merge process to work properly. You will need to include Name, Domain, Mac address in your predefined computer for this fix to work properly.
This will also be included in 7.6 HF4 release if you choose to upgrade instead.