Blended curve nor redering right

 From:  NightCabbage
4101.1 
Hi Michael

I've just started using the Blend tool to get a nice smooth interpolated curve between 2 other curves.

Seems to work really well! :)

Only problem is that it doesn't display right some of the time.

I've attached a pic of what I mean (and the moi file).



The one on the left is what it should look like.
The one on the right is the exact same thing - but I've panned the view down by about 5 pixels, and all of a sudden, the blended curves turn into a straight lines!

Only seems to happen when zoomed in a bit of the way, and I haven't encountered this with curves created by other means.

Thanks!