I have always used Scalos from "AROS-20180423-1-any-i386-contrib.tar" on AROS x86, where the Scalos preference program works but I do not have the Menu on the Workbench and the automatic layout does not work.
On AROS 68k Scalos, on the other hand, the Menu works and the automatic icon layout works as well, not work Gadgets, I have to certify better
For DualPNG Icons if you don't have automatic icon layout you can't make the right assessment, on the Scalos site there is no information (at least I don't see it) about support 100%100.
See screenshot, graphical artifacts that could depend on Dual PNG ? The problem may disappear with automatic icon arrangement.
I would add that Scalos 68k was compiled with GCC 6.5.0 while Scalos x86 was compiled with GCC 6.3.0