I´ve found the same problem in other wordpress sites with te same theme. I think it´s a bug of the Swift theme.
Hello. I have the same problem in my site – http://www.musculacao.net/.
It´s a bit strange, but sometimes when i open my site, the widgets and the menu don´t appear. As you can see in this image.
http://www.musculacao.net/wp-content/uploads/2013/08/A111.jpg
The side bar and menu appears if i make refresh or if i move the browser window ( i use chrome). As you can see in this image. http://www.musculacao.net/wp-content/uploads/2013/08/A1112344.jpg
Any possible solution?
Thanks in advance.