What type of computer sleeping do you have your comp set to. It might be related to computer/monitor sleep or your screensaver clashing with LW. U said it only happens when you're away from your comp. & that's when your comp sleeps/screensaver comes on (certainly hope u don't let it sleep whilst it's on the net!) I don't know about osx, but in earlier mac os's, screensavers were infamous for clashing with other apps or even the system. Try disabling your screensaver when using LW, after all, you're not going to see it if you're not there. And turn your monitor off if you're worried about it. Hope that helps.