Hi all, I want to thank the combination of Pharo Launcher and the pharo-core github repo for earching a specific bug in Pharo 3, linked to https://pharo.fogbugz.com/f/cases/11949/ : I noticed that the bug was introduced between 30450 and 30490. With the Pharo launcher, I then went through a ad-hoc bisecting (loading the right image version / launching it / testing) : Start point is 30450 No bug, 30490 bug. 30470 No bug 30480 No 30485 Bug 30483 No 30484 Bug Then I tried to view the changes in Morphic for the bug out of the Monticello tools... Didn't work :( It's hard to guess which versions have changed and when in relation to the image version number. So I went to github/pharo-core and I searched for the relevant commit: https://github.com/pharo-project/pharo-core/commit/5034553d07f342a5a0e512757... And a file that could be relevant: https://github.com/pharo-project/pharo-core/commit/5034553d07f342a5a0e512757... And there I could see things in relation with MorpTreeMorph... Bug solved shortly thereafter. Damn Rectangle stuff :( Thanks again -- Thierry Goubier CEA list Laboratoire des Fondations des Systèmes Temps Réel Embarqués 91191 Gif sur Yvette Cedex France Phone/Fax: +33 (0) 1 69 08 32 92 / 83 95