On 5/17 we updated the download of MyEclipse 3.8.4 Beta for Eclipse 3.1 to support the Eclipse 3.1M7 build. Those needing M7 support will need to download the latest release since prior builds will not work on M7. Also note that the new build will not work for prior Eclipse 3.1 milestones; it is for Eclipse 3.1M7 only.