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I don't succeed in getting factorization (ggb5 ok - no action gg6)
In AlgebraView I have some matrices as examples. An assignment in the CAS is lost by changes to other lines. Try to define CAS
[1] A:=A3
and change
[4] E(2,3,1) (A - l identity(n))
ggb5/ggb6
The same problem 
Sorry, I don't see a difference here. Please post a .ggb file for the first screenshot
https://www.geogebra.org/m/fzgabmq4
Hm,
when I make a new file I got a factor setting and some phantom objects (ggb6 only even in linked file)
but in linked file I got no action using factor button
Sorry, that file also looks the same in both versions here (the phantom objects are from using an older version - please upgrade)
I do use actual versions, both.
I mean this file: https://ggbm.at/upUZg79r (and all local versions of this file do not factorize with button)
factor button does not work (ggb6 online and local installs) - i have to use command factor(...) to get factorisation.
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