Marker is created at [0,0,0]

[Luft08 27]

When I run the following code the marker is created at [0,0,0] instead of the position specified:

private _marker = createMarker["southForestMarker", [8926.676,5542.027, 0]];
southForestMarker setMarkerShape "RECTANGLE";
southForestMarker setMarkerAlpha 0;
southForestMarker setMarkerSize [6000,6000];
southForestMarker setMarkerDir 0;

I can move the marker with:

southForestMarker setMarkerPos [8926.676,5542.027, 0];

But I don't understand why I need to do that.

[Harzach 2518]

_marker = createMarker ["southForestMarker", [8926.676,5542.027]];  //z coord is unnecessary unless you need to pass it to another command
_marker setMarkerShape "RECTANGLE";
_marker setMarkerSize [6000,6000];
_marker setMarkerAlpha 0;
_marker setMarkerDir 0;

No reason not to stick with the handle when creating the marker. Regardless, you need to put marker names in quotes, always. This does nothing:

southForestMarker setMarkerShape "RECTANGLE";
southForestMarker setMarkerAlpha 0;
southForestMarker setMarkerSize [6000,6000];
southForestMarker setMarkerDir 0;

Your original code corrected:

private _marker = createMarker ["southForestMarker", [8926.676,5542.027, 0]];
"southForestMarker" setMarkerShape "RECTANGLE";
"southForestMarker" setMarkerAlpha 0;
"southForestMarker" setMarkerSize [6000,6000];
"southForestMarker" setMarkerDir 0;

[killzone_kid 1333]

southForestMarker is variable which is undefined
"southForestMarker" is the reference to the marker you created