O2 is a new code browser in which class categories have been replaced by packages.To load O2, open a workspace and doit the following expressionGofer new squeaksource: 'MetacelloRepository'; package: 'ConfigurationOfO2'; load. (Smalltalk at: #ConfigurationOfO2) perform: #loadDefaultBugs in O2 may be reported on the google code website for Pharo (http://code.google.com/p/pharo/). Add an entry there and put David and Alexandre in Cc.