Two possibilities to check into regarding how you are doing the imaging:
1. The NC software expects to have the video driver installed before it is installed itself -- so by imaging first and then installing the video driver this will likely cause video problems (also, make sure you install only video drivers -- not applications like AMD's Catalyst Control Center - those kinds of apps can cause problems and are really not needed for the video card in the host).
2. the NC software and the devices need to be registered/activated on each machine. For your master image you should not do the registration/activation for the devices/NC SW. Then once you image, you'll need to register the hosts/devices (you may be able to use a similar process described for imaging X350/550 systems that is detailed in the NC online KB - just search on "imaging").