I try to create a 3D from a received 2D drawing but the "Next" button is greyed out.
I thougt it had something to do with the dxf but when I tried to do the same following the tutorial with the original SE files I see the same:
You have noticed that in the 'Prompt bar' you see "select elements to define the primary view"?
OK, so solved for Joris but not for Fiorini?
Then I would suggest to log a case with your support, or post your problem drawing here.
It works (as desined by developers ) well on my ST8 MP6...
Where is your dxf? On the 2d model sheet or on the working sheet?