[audriuxxx]

if(strcmp(cmd, "/invisible", true) == 0)
{
for(new i=0; i < MAX_PLAYERS; i++)
{
if (IsPlayerConnected(i))
{
SetPlayerMarkerForPlayer( playerid, i, ( GetPlayerColor( i ) & 0xFFFFFF00 ) );
SetPlayerMarkerForPlayer( i, playerid, ( GetPlayerColor( playerid ) & 0xFFFFFF00 ) );
}
}
return 1;
}

And i have same problem. From far i don't see, but when i get closer i see a marker. Like in link which i give, i do the same, cikle, then set marker like in this command, just when spawn. Maybe here is sa-mp bug?