YMG,
Don't get mad at me.
I edited my point list to insure there are no decimal 0's. There were a couple were that "x.004". That may have entered your round out tolerance. Just for perspective... the topo area is at about 140 acres.
I did not insert any break lines. Built the TIN and it was fine. But when doing contours I noticed sticks everywhere. Contours were busted with throw outs... the sticks. I looked closer and they were all depression contours. Additionally, the depression contours weren't depressions. Something is wrong.
So I took the depression code out of the lisp. Rebuilt the TIN, and built the contours. The contours built perfectly.
To go a little further, I inserted the 650' break lines, rebuilt the TIN, then did the contours again. It did not crash, and again, it built the contours perfectly... giving full respect to the break lines. No sticks anywhere.
My conclusion is that the depression code has the fault, and is causing the crash.
By the way... and it is just my opinion, but I would like the depression lines to be optional. I wouldn't usually want them.
Rick.