Hmm maybe this explains better
When the green bullet sprite is not in container:
<img src="https://dl.dropbox.com/u/5214903/GM/errors/spawn%20issue1.jpg" border="0" />
When the green bullet sprite is in container:
<img src="https://dl.dropbox.com/u/5214903/GM/errors/error%20when%20bullet%20in%20container.jpg" border="0" />