Hi Matsuo,
OK, I see the problem you are having.
The problem is the initial size of the single track, if the size does not divide the curve exactly (or very close), then you will get a gap or as in your example an overlap.
One way would be to divide the curve using array of a point or line, then scale the single track to fit, then the array of the track will fit correctly.
Example:
I have drawn a vetical line to the curve, then made array of that line around the curve, for that, you select a number rather than a spacing, then the curve will divide correctly.. (I entered 25 for your tracks)
I then scaled the track to 2 of the curves
Then made array of the track (again 25)
Hope that helps. Just post if any questions.
 manz
