MyEclipse users using a MacBook pro with the new Retina display could experience display issues due to the incorrect rendering of fonts and other related problems. This is an Eclipse issue which affects MyEclipse and all other Eclipse based applications.
Additional details and a workaround for this issue can be found in this thread: https://www.genuitec.com/forums/topic/retina-display-support/
The MyEclipse 2013 release will incorporate the workaround, no additional manual steps will be required.