Why is it that when you make something, then save(or stamp) it, then it fails catastrophically, even though it didn't before? Happened with my O2 vent. (before: smoke didn't burn plant; after: it does burn plants)
Some types of information get lost during the saving process. E.g. the 'flags'. However this should normally not effect the behaviour of a creation. Maybe you experience a rare case where this actually does effect the behaviour.
