I've been fiddling with the Veterancy Behaviors, trying to get a good leveling system working- and it works fine but for some reason it shares XP earned by default.
Field ALLRANK Veterancy (Basic) Stats: Shared Radius + (0|0|0)
Field ALLRANK Veterancy (Basic) Stats: Shared Fraction + (0|0|0)
and Share Filters excludes all players for all types. Yet all nearby units gain exp when an enemy unit is killed. What gives???