In SEOW maps, some roads are very long and have many way-points records in the Highways table.
I had a problem in Smolensk map: Ground units stopped at a crossroad. I checked Highways and Highways_Intersections tables ==> no errors...
Then, last Sunday, I meet the Big Boss in Annecy and, of course he gave me the answer: In DCS, set the number of ground FMB way-points to the maximum (100). I tried and now all's correct. This could be useful for all admins. Thanks Shades!
Yes Dore, that was the issue. The reason the DCS has this configurable setting is to allow the admins to prevent their mission files getting too large. Consider 50 moving vehicles, each with 100 FMB waypoints = 5000 waypoints for the game to track in the mission. This might cause poor game performance. The default setting is 30 waypoints per platoon.
Anyway, admins can adjust the playability and CGM settings to suit their own purposes, just like Dore has above.