Using the  3.8 Refactoring Browser in 3.9 doesn't work too well.

Some issues I have seen:
- renaming instance variables doesn't update the display of the Class
definition (eg. rename b to bytes -- the iVar is renamed but you don't
see it as such until you deselect and reselect the class definition)
- trying to rename a method has rendered my image non-responsive until it died

I am using Squeak 3.8.12beta4U for Mac on a MacBook Pro Intel Core Duo.

-- 
Jason Rogers

"Where there is no vision, the people perish..."
    Proverbs 29:18