I reported this bug some time ago together with screenshots. It only appears on retina screens: https://pharo.fogbugz.com/f/cases/14674/Artefacts-when-moving-windows-morphs-on-Retina-screen Even as it is only a minor detail, it makes Pharo's first impression look pretty bad.
<http://forum.world.st/file/n4820557/artefacts_pharo3.png> <http://forum.world.st/file/n4820557/artefacts_pharo4.png> -- View this message in context: http://forum.world.st/Pharo-4-0-display-tp4820518p4820557.html Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.
