Widgets do not display

My website is http://workoutswithoutweights.net

I have been using the twenty ten Blogging Inside theme but have recently had some problems with the widgets displaying. I have been using easy popular post plugin which shows an error message in the sidebar widget. Also, the footer widgets has stopped displaying. I have checked my widget area in the admin panel and they show that they are in use in the widget area.
I have re-installed wordpress and I have disabled recent plugins that I have used.
Do you know of any reason why the widgets would stop displaying? Does this sound like a hack or security issue?