a bugfix release is available that hopefully resolves issue 62
which affected mutliple users. When updating, make sure that you use Eclipse Luna (4.4) or have the Luna update site
in Preferences > Install/Update > Available Software Sites. (The Xtext update site is no longer required since the Luna update site already contains the necessary Xtext 2.7.3 dependency.)
If you encountered this issue, please report whether the fix worked for you or not.