SOLUTION: (For me anyway)
I use a 3rd party product called ReShade. I know this is popular for many other users. This solution was shared to me by Tomatosalat. Thank you @scandinavian13 and @mfrantz for attempting to help solution the issue.
PSA: If the login part for navigraph doesn't work for you (white display only), it might be because of reshade.
• Go to your P3D folder
• Locate the file dxgi.dll <- thats reshade
• Rename it to dxgi.dll.off
• Start P3D, start the 747-8 and do the Login process within the EFB
• Close P3D after its done
• Rename the file back to dxgi.dll
Continue to be wonderful at what you do guys!