If you clone from a running system, you invite the signature issue. Its always been recommended that when cloning, use the USB PE Recovery boot system. Once the cloning is completed, remove the cloned drive or disable it by unplugging its connection. I believe the same would hold true for Imaging. Creating the image is no problem from a running system, but restoring it to a different drive in the same system will cause problems when restoring from the running system. Again use the USB recovery system to restore to a different drive, and of course remove that drive, before you boot up to the current OS.