You can describe issues here on the list or on our issue tracker: https://code.google.com/p/pier/issues/list Pharo contributions CI creates 4 different images. It helps to know if the problem is in one or all four. And having issues as separate mails helps focus. The issues we found with Pier3 on Pharo3 were not difficult to solve. Mostly replacing deprecated and removed functionality (FileSystem, WARenderCanvas) Stephan