I had the same problem. Homepage of my blog was totally blank. Nothing in the source code.
Problem: I didn’t have a current theme selected, and I couldn’t select a theme on the theme’s page, nor could I access the ‘Theme Editor’.
Solution: I had my folder permissions set wrong and had to CHMOD the wp-content directory & all sub directories to: 755. I think this is do do with allowing the ‘Execute’ permission on these folders.
It fixed the problem for me! Does this work for anyone else?
