points on implicit curves
I typed "y^2 = x^3" into the algebra panel and attached an arbitrary point, A = (.90, .85) to the curve. I then zoomed in one mouse click. The point moved to A = (.66, .53). The location of the point seems to depend upon the window size. It happens for every implicit curve I tried. Attached are two ggb files (before and after I zoomed) which demonstrate the problem.
As I was filling out this report, I noticed that the point also moves when I change the geogebra window size on my macbook pro. Let me know if you need more information.