Creatures stop spawning!?

[Unregistered]

Im making a map that uses region triggers to spawn monsters inside another region and for some reason the game will only let me spawn monster(s) once or maybe twice when played. I say WTF, but im probably missing something. Please help if you know anything.

 

[Darg]

Could you please write down your trigger code for me? I can't say too much without looking at it.