A perhaps too simple fix for my homepage and source editor problems was to take the lines from my alpha version and put them in my user.js in the beta version. My user .js has --
user_pref("kmeleon.general.homePage", "
http://www.perigee.net/"
user_pref("kmeleon.general.sourceCommand", "C:\\Program Files\\Visicom Media\\AceHTML 5 Freeware\\acehtml.exe");
user_pref("kmeleon.general.sourceEnabled", true);
It is not fancy, but it works.