Hi Michael,
Just tried that change but still no go its like it cant read the center line for profile. Strange as if I import the same DXF profile center line into solidworks and just lock tangents and re export it all imports correctly. It would be great to have the complete workflow coming from MOI as it wins hands down in modelling time. At this stage I am doing all the prep in MOI then export the individual master profiles into solidworks for export from there which works.

If not an easy fix all good Ill keep doing the same workflow just made me wonder if tangency did have a finite point in the transition from arc to arc.