Symbol $box being changed to mbox
You're right. Fixed by commit [4be0ef]
As I have suggested to you before, there could be a second set of Debian packages, maxima-sbcl or something else, besides the packages maintained by Camm.
I agree with Robert, and I'm still puzzled by the fact that Maxima 5.49 + GCL works fine for me but fails for Raymond and Jerome.
Changed the first plot2d example in the Introduction.
Updates the plot3d example in the Introduction chapter of the manual.
Adds a comment with the Maxima version and date/time in the graphic files.
Change the last clause in cod from otherwise to T.