Maxima backend don't work: you run entry, but calculation never ends. It's happend, because backend use special lisp configuration file (cantor-initmaxima.lisp) for better output processing but the file don't exist, bacause it have be removed in 616dc4159c7bbeeca962af58adbcccd025ddc723, I think, accidentally. So, If you have this file (from previous cantor installation, for example) all is okey, but if you don't, you can't run maxima entries. So I have recovered the file.
But there is some change, compared Application/15.12: Output is plain text, instead nice LaTeX image. I think, it bug too and i will try solve it later.