Uploaded, and uploaded again, and the problem repeatedly happens.
WordPress is working, except when I want to deal with appearances. If I go to appearances and choose a theme, it's a blank page. I try a different theme - blank page. No live preview; even after choosing a theme, no visual preview. Simply a sidebar telling me I'm previewing X theme (including a pre-loaded one), with dropdowns for site title and such, and a white screen for the rest of the page. I've tried using IE, Firefox, and Safari; I've used a Mac and Windows. I tried on a different site I also own - same thing, blank whiteness where there should be a visual preview. All software is up to date, no widgets or whatnots have been added.
Thoughts on how to allow me to actually see the website?