--- a/src/vehicle.cpp	Tue Jun 12 23:35:10 2007 +0000
+++ b/src/vehicle.cpp	Wed Jun 13 01:38:00 2007 +0000
@@ -540,6 +540,8 @@
 
 void ResetVehiclePosHash()
 {
+	Vehicle *v;
+	FOR_ALL_VEHICLES(v) { v->old_new_hash = NULL; }
 	memset(_vehicle_position_hash, 0, sizeof(_vehicle_position_hash));
 	memset(_new_vehicle_position_hash, 0, sizeof(_new_vehicle_position_hash));
 }