I have just seen your last posts. I noticed the same thing few days ago, but I already singed the paper. Not to worry it was alright since I didn't use manipulate, nobody (not even me till I increased the time frame), noticed that it makes these unstable orbits for small values.
I also managed to solve on my own this thing with 1, -1, I thought you won't answer anymore, still thanks for your effort.
I would ask you if you could check one other of my posts. It concerns my last assignment. I have to interpret some code from wolfram demonstrations, but I am having troubles with it and I was wondering is there any explanation from the authors anywhere or some link that I could find literature that would explain this specific problem.
The link to my post is http://community.wolfram.com/groups/-/m/t/291006?p_p_auth=3MDolqmY
A comment from you would do good.
By the way what is your profession, I mean since you obviously know this stuff are you a programer or something like that?
Thanks once more, your help was of a great use.