A simple solution is found in this patch: https://sourceforge.net/p/maxima/mailman/message/35816787/ I tried it (I recompiled wxmaxima-16.12.2) and it works fine now.
Hi, I have exactly the same problem here. With wxmaxima-16.04.2 everything works fine, but with the new 16.12.2 suddenly all emmbedded plots are very tiny and their size cannot be changed with wxplot_size() For the moment I revert to using the old version until this is fixed.
plotting complains about "bad format character" on ARM platform