Program endgame_solver now works fine.
Was missing the board module initialization!!!
It took one week to recognize it (even if several improvements has been added in the while).
Now there is a few rationalization to do and then it is time to start the a-b improvements!!!
Today on my hardware [Intel(R) Core(TM)2 Duo CPU     T8300  @ 2.40GHz] the FFO-40 position gives the following results:

node=460,529,747; leafs=113,304,014; seconds=212.916; NPS=2,162,964