Look this is what im trying to do:
scourge goes to a location (leaving invisible drones burrowed on its way) then i make the unit that spawned the scourge follow the drones path. i use a small location that moves from the hero to the drone that is on that same location, then kills the drone, and then moves the hero to the location. and so it follows the path to the end. The problem is that... it... only... works.... WHEN IT GOES FROM LEFT TO RIGHT =...='') idk why this happens but when it goes from right to left. the hero just gets stuck on the same place... "hero".
If someone has any idea whats wrong :S... please tell me.

l hero drone l drone drone drone
_____ l hero dronel drone drone

XD thats some sort of illustraition of what i do. The l l is the location

Trigger("All players"){
Conditions:
Switch("SWITCH1", set);
Command("Current Player", "Zerg Scourge", Exactly, 0);
Bring("Current Player", "Fenix (Zealot)", "fighter2", Exactly, 0);
Bring("Current Player", "Fenix (Zealot)", "drone", At least, 1);

Actions:
Preserve Trigger();
Comment("tracker2drone");
Move Location("All players", "Zerg Drone", "drone", "drone"); //centers the location on closest drone)
Wait(1);
Remove Unit At Location("All players", "Zerg Drone", 1, "drone"); //kills that drone so it centers on the next one
Move Unit("Current Player", "Fenix (Zealot)", All, "Anywhere", "drone");// moves hero to the new position of the location
Create Unit("Current Player", "Protoss Arbiter", 4, "drone");// this is just an effect.
Kill Unit("Current Player", "Protoss Arbiter");

drone is the small location that im talking about.
please tell me ANYTHING u think could affect the fact that only works to 1 direction.

EDIT: oh i forgot to mention, that it does kill the drones on the location but it doesn't center itself on the drone before killing it or something like that :S (when it goes right to left)

starcraft centers units starting from the left.
if its _________DRONE DRONE DRONE hero
and you want it to move to the ___________
i think you have to center it on the third drone.
this is described in the wiki where they explained mobile grids.

yea but i dont want that, i want it to go All the way through the drones path. or else i would just teleport it to the location .

well, the easiest way i can think of to do this is mobile grids =O
http://www.staredit.net/wiki/Grid_Systems

Try alternating the owner of the drone. Like, spawn a P9 drone, then a P10 drone, then a P11 drone, then 12, then 9, then 10, then 11, 12, 9,10,11,12 so hopefully then there will not be 2 drones next to each other of the same player. Only thing is, you'll have to keep track of which drone to center the location on next. Shouldn't be too hard though.

Also, you can't spawn units for p9-12 directly, but you can spawn for say, P5 then use the "Give" action to give them to P9-12.

Also, please do not create UMS Help topics with names like "PLEASE HELP." Indicate the topic at hand like "Drone Spawn triggers" or we will close your help topics.
See Rule #1 http://www.staredit.net/topic/3639/

oh lol sowwy, i didnt know how to call the problem xD. and hmm that alternating drones seems like a good idea. and yea i know u cant do that. i was using the give unit action. ok thanks man ima try that.

>> closed

But why don't you use 2 different sized locations? One '1x1' squares and one 'big' enough to center on the next drone, but small enough not to cover 3 drones at once.
- Center both on the 1st drone (assuming you can properly determine the start of the chain. If not, just use a different player, but only for the first drone.),
- order the hero to the '1x1' and
- kill the drone at '1x1', then
- center '1x1' on the drone at 'big' and then
- center 'big' on the drone at 'big'.
In this order!