Intersect for hyperbola and arc switches variables
When using Intersect for a circular arc and a hyperbola, the points of intersection change to new variables with relatively minor movements of the arc defining points. I speculate this has something to do with the way that points of intersection of the complete circle and the hyperbola are ordered, but it seems to be that intersection variables shouldn't change under small deformation.
To replicate: in the attached .gbb file, drag the point B vertically up. You will see the points F,E change to new points H,G with F,E becoming undefined.
OS: OS X 10.11.4 Beta
GeoGebra 184.108.40.206-3D (29 January 2016) Java: 1.8.0_20