Hi, a series of things were fixed after RC2, especially to gain Windows compatibility in the new wxpython graphical user interface which is now included also in the OSGeo4W built. We'll package GRASS 6.4.0RC3 tomorrow (26 Jan) if there are no urgent obstacles. Please complete http://trac.osgeo.org/grass/wiki/Release/6.4.0RC3-News Markus