Frank Shearar uploaded a new version of ReleaseBuilder to project The Inbox:
http://source.squeak.org/inbox/ReleaseBuilder-fbs.85.mcz

==================== Summary ====================

Name: ReleaseBuilder-fbs.85
Author: fbs
Time: 17 December 2012, 12:30:35.978 pm
UUID: 21ecfa59-7073-42b0-94fb-af8d251b9143
Ancestors: ReleaseBuilder-fbs.84

It looks like #enableIPv6: false will only _sometimes_ disable the new network stuff. #useOldNetwork: is much more direct.

=============== Diff against ReleaseBuilder-fbs.84 ===============

Item was changed:
  ----- Method: ReleaseBuilderFor4dot4 class>>setPreferences (in category 'private') -----
  setPreferences
  	Preferences 
  		installBrightWindowColors ;
  		setPreference: #scrollBarsWithoutMenuButton toValue: true ;
  		setPreference: #swapMouseButtons toValue: true ;
  		setPreference: #annotationPanes toValue: true ;
  		setPreference: #showSplitterHandles toValue: false ;
  		setPreference: #showBoundsInHalo toValue: true ;
  		setPreference: #alternateHandlesLook toValue: false ;
  		setPreference: #roundedMenuCorners toValue: false ;
  		setPreference: #roundedWindowCorners toValue: false.
  	PluggableButtonMorph roundedButtonCorners: false.
  	FillInTheBlankMorph roundedDialogCorners: false.
  	Workspace shouldStyle: false.
+ 	NetNameResolver useOldNetwork: true.!
- 	NetNameResolver enableIPv6: false.!