Actually yes, that is checked here too but I still don't get a normal tag that I can delete. I do via Riptide but not the standard importer.

[Edit] Sorry just re-tested that, I was wrong. I do get the normal tag from Moi obj files. I tested a Cinema OBJ which didn't bring normal tags. [Edit]

I remember the advice some time ago was to import LWO rather than OBJ, was that related to this issue?