Thanks John.
I'm not working directly with a schematic's autoroute function, only manual routing.
At last it works! - now I have VIA thermals on bottom layer.
You are right, naming polygon gnd in command line and clicking on it, name gnd
I started with clean board - no polygon - only vias and track.
TOP 1, BOTTOM 2, VIAS 18, tplace 21, torigins 23, names 25, tvalue 27, tdoc 51.
DRC - supply - tick generate thermals for VIAs....apply....select.
name all VIAs gnd.
polygon - select thermals in top tool bar to ON.
draw polygon - name in command line gnd and click on polygon, name gnd.
click on ratsnest.
view bottom layer to see thermals
I think that's it!
mike