PageBuilder not working on Home page – just big white box

I’ve created a site with a Home page and about 12 additional pages. Over the past two days, when I open the Home page for editing, PageBuilder usually doesn’t load (nor does standard editing). There is just a big white empty content box. PageBuilder does seem to load the first time I go in to edit, but when I make a change and hit Update, the content does change but then I get the empty white box. This happens only on the Home page – PageBuilder works fine on every other page.