The problem is that it only spawns when the first of a series of boxes are within a range. So if there are 2 boxes close enough, only the first one to enter the range would spawn a monster.
if I remove the trigger once from the spawn it spawns monsters from all spawners indefinitely.
Am I just coding this wrong or is it not doing what it should. My the appearence, it should trigger the instance box to true when the instance enters the range, and therefor trigger the spawning action once, per instance that becomes true.
It may be related to a bug I filed as something straightforward (array_curvalue=95 when the only values are -1 0 and 95) doesn't toggle as well.