Hi Mike, if you zoom out a little bit in the Top view you should see it then draw correctly.

It's the same display glitch as described here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=7590.3

I may try to get this fixed up for v4, but it may be difficult to fix without negatively impacting performance somewhat for all curves, that's the reason why I haven't messed with it yet.

- Michael