Ok, I downloaded and installed this again, and then shot down about dozen or so lightscouts and maybe half of them worked ok, but the rest had no floor close the impact zone (the place where there is fire and smoke)
I checked the UFOfloor-03-01_spectre.xml and HP was set to 0. Also the large floors in ufo_lightscoutfloor folder are HP 0.
Next I'll make a clean install..