Had 32bit version 6.2 installed and working w/o any error. I updated to the proposed 6.3 version when SH3D suddenly errored out mentioning that I have to update the DirectX/OpenGL drivers. Update done, error remained.
Reinstalled 6.3 but 64bits this time. Same error.
Downgraded to 6.2 (32b) (Java v1 ...