[Pharo-users] How do I remove old classes?

I have been having an enduring problem with Pharo "disappearing" on any machine I try it on. In an effort to resolve that it isn't my code, I want to remove the Package that contains all my Seaside code so that I can install a minimal home page under Seaside. This will, at least exonerate my code. However, I have removed the offending package, executed Smalltalk cleanUp: true but I can still get into the old code. A debugger comes up when I try the old code and it shows "AnObsoleteCNWMeetingsGalleries(AnObsoleteCNWBasic)" so the code is still there and all the bots that have the address will still be calling it. How do I finally remove the code? David Pennington