Masashi, I have been trying to do some testing of Pharo 1.1 through a Seaside 3.0 daily image. One of the first things I load is SIXX. Pharo has been addressing underscore assignment problems, and the default is now to treat them as syntax errors, and one was identified in SixxAutoMorphMemento class>>release. I have also noted them in the #instDict and #instDict: accessors. It would be helpful if you could change the underscores to := for future releases. I am not sure how to tell if there are other underscore assignments in the .sar. Thanks for SIXX! Bill