I started getting this same error message today. NXT 7 has been working fine on my HP Z4 G4 (Win 10 Pro Version 1909 OS build 18363.1139) workstation creating DVDs. When I went to create a DVD today which was a simple modified version of one I did last week, it gave this error and the application froze when I try to preview, save as an ISO, or burn a disc.
WITHOUT_D3DX: VCPOverlays/Overlay Chroma.CreatePixelShader:CreatePixelShader not implemented
I upgraded to NXT 8 (MyDVD Build 188.8.131.52) and it gives me the same error.