This seems to be because it sends the 'max' message to an empty
OrderedCollection (since there aren't any new changesets since 2.4
was released.)  Try this fix:

'From Squeak 2.3 of January 14, 1999 on 21 April 1999 at 5:25:01 pm'!

!ChangeSorter class 
	methodsFor: 'as yet unclassified' 
	stamp: 'jcg 4/21/1999 17:02'!

highestNumberedChangeSet
	"ChangeSorter highestNumberedChangeSet"
	| oc |
	oc _ (self allChangeSetNames 
		select: [:aString | aString startsWithDigit] 
		thenCollect: [:aString | aString initialInteger]).
	oc size > 0 ifTrue: [ ^ oc max] ifFalse: [ ^ 0 ]
! !


On Wed, 21 Apr 1999, Smilie wrote:

> 
> I just downloaded 2.4 and have been playing with it.  Very cool.  One
> problem though.  While in a Morphic project, I made the flaps appear.
> Every time my mouse goes over the Squeak flap, an error window appears and
> then the flap opens.  The error is:
> 
> attempt to index non-existent element in an ordered collection
> 
> Thought someone might want to know.
> 
> --------------------
> Jen a.k.a. Smilie
> :-P
> smilie at cc.gatech.edu
> 
> 
>