Under certain circumstances Ayam writes files where
instance objects get wrong OID (ObjectID) tags.
When reading those files, Ayam is not able to connect
the instances to their master objects and removes them.
This happens when scenes with instances are loaded,
some of the existing instances are resolved and new
instances are created. Those new instances will
get wrong OID tags, because the tags from the old
master objects are not removed before writing.
Work around for Ayam1.1:
Remove all OID tags from all objects manually
or with a script before saving the scene.
