Camera goes off path

Hi,
I have an animated project with a house and a Camera going around the house, the animation done by a path as a Parent of the camera, and the camera following the path (and Tracked to an Empty target). It worked well.

I had decided to add another (very long, ~95% of the whole new path) segment to the path, by editing and E (‘extrude’) button. Done.

The problem is:
on the new path the camera follows well the new part of the path, but when reaches the old one, leaves the path, and moves much closer to the house (on a straight trajectory), then, for a point, touches the path, goes off again, and so. (For me, it looks like a resolution problem).

What’s the matter, and what’s the solution?

PS
Blender 2.57
The attached image shows the spiral-like path (continuous line, starting approximately from Down), and I made a Calculate Paths, that shows the more or less actual straight, polygon-like real path of the Camera with dashed line. The 3D cursor is on the camera and the path, at the start of the original path.

Thanks

Attachments


Solved, curve’s Resolution/Preview U was set to 100 from 12, this solved the problem.