Perhaps you accidentally deleted one of the widgets? Like a News widget or something? Or perhaps you had some news on there which has just passed the threshold for age that was set for the widget (ie, perhaps it was set to only show news from the last week, and there was nothing within the last week?). It really depends on what you mean by "empty" :p
Are ALL the widgets gone, do you only have a blank page and a navigation bar?
I've had a quick look at your site and, although there's not a huge amount on there, there is some content (albeit some appears to have been placed very recently). That's assuming we're talking about: http://a3onfluxsa.gamerlaunch.com