Hi Michael,

Yes, you are right the root of the problem is that nasty fold close to the base of the surface I was working on. However, I thought I should report it to you because:

when I mirror the surface in C-plane mode and then join it I get an artifact and this issue doesn't occur in default mode! So, I thought I should report it to you!

And one more thing: If it is possible for you please mirror the surface along the green axis in C-plane mode (the file I sent) but don't join the two surfaces just close MOI3D and save the changes you made, then re-open it and
you probably will see the artifact on the Mirrored surface.

>Over here if I reset the cplane back to default and then mirror and join in the Front view I seem to get the same artifact.

Dear Michale as I mentioned before when I reset the C-plane back to default and then mirror the surface along the green axis in the Front or Right view I don't get any artifact!

I just thought I had to report it to you, I don't think it is a big deal :-)

Best,
Psygorn.