Those experiencing the problem are left in the cold. They unset the treemenu module and have to dig in the various dialog to find the offending.
In 1.16r10, the treemenu build is producing a file /var/run/treemenu.log. This file is updated after each menu entry is processed. So if Linuxconf fails in one area, you can tell where just by looking at this file.
Oddly, this treemenu build looks more and more like a crude regression testing.