Answered
In this Applet, there exist - after saving - two different objects (Line, slider) with the same name.
This occurs twice (c_1, c_2).
So the some depending obejcts of c_1, c_2 are ni further defined and the applet doesn't work correctly.
Files:
Cubeoctahedron_...
The same question 
I think one is called
and one is called
c_{1}Does renaming them help?
no; al hacer clic derecho y renombrar en ver5 saldría el nombre con los corchetes y este no es el caso
además haciendo clic derecho salen tipos distintos
el problema es en los nombres automaticos en 3D
crea dos numeros y llamalos c
se renombran como c y c_1
crea un triangulo en la ventana 3D; observa el nombre de los lados
si el triangulo se crea en la ventana 2D los nombres son adecuados
same problem in ver6
We've made some fixes for the next release (v486). If you still have trouble with that, please provide simple steps to reproduce the problem
it continues
GeoGebra Classic 5.0.486.0-d (Java 1.8.0_161-32bit, 247MB. CAS Initialising) 18 August 2018
open algebra view and 3D view
type in input bar
c=3
c_1=4
then, using the polygon tool, create a triangle in 3D view
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