Hi mike,

> I jointed all parts of the upper profile curves to one curve,
> made a copy which I moved more up and then made a loft. So
> why is this still not "one" object?

It's because the curves you are lofting are made up of multiple sub-segments. If you select one of them and use Edit > Separate you should see that you can then select different individual segment pieces. When you do a "Join" you don't eliminate segmentation, the segments are still there kind of like a group.

The easiest way to eliminate segmentation from a curve that is made up of multiple smooth segments is to use the Rebuild command on it:
http://moi3d.com/2.0/docs/moi_command_reference10.htm#rebuild

- Michael