Hi Guys I am trying to use Pharo1.4 Latest update: #14438 as downloaded in the Moose 4.7 image. I am loving most of the changes and system tools - well done all! But I am coming up with a worrying bug where there is a difference between Source code and decompiled source code. Specifically, this occurs with two set methods which point to the wrong instance variable slot. So, when the code runs, the wrong variables are updated. Here is an example: Class definition: Thing subclass: #Relationship instanceVariableNames: 'context fromNode properties relType toNode' classVariableNames: '' poolDictionaries: '' category: 'Sapiento' Source Code: relType: anObject relType := anObject Byte Codes: 13 <10> pushTemp: 0 14 <62> popIntoRcvr: 2 15 <78> returnSelf Decompiled Code: relType: anObject properties := anObject NOTE: properties is updated instead of relType. I may have added a new instance variable since the original class definition. Are there known issues / available fixes around this? Please advise Thanks in advance. Graham