Cameron over in the L4 Mac forum has a helpful post
http://community.logos.com/forums/t/30817.aspx
Bottom line, if you've ever been on the Beta before in the past and don't want to get hit with a potentially buggy Beta 1 automatically. Run the command Set Update Channel to Default
Do this now or you could be sucked in.
See: http://wiki.logos.com/The_Logos_4_Beta_Program and http://wiki.logos.com/Update_Channels for more info about how this works cause chances are you're confused about it.
Personal note: WoooHooooo for a new Beta coming soon!
