UnscriptedPlayer>>assureUniClass
	"Create a uniclass and become the receiver into it"

	| anInstance |
	anInstance := self rootClassForUniclasses instanceOfUniqueClass.
	anInstance initializeCostumesFrom: self.
	self become: anInstance.
	^ anInstance

As I understand it, after the become: self is anInstance and anInstance is self.
So this would answer the original UnscriptedPlayer before the become...
Is this really the intention?
Otherwise, becomeForward: would work better.

Nicolas