Yesterday I updated to 2.1.3 from 2.0.9. Now in the Presentation > Themes tab, none of my themes (including the default themes) show previews. In addition, in the Theme Editor, I get an error message saying "Oops, no such file exists" for every theme.
The themes I use have an options tab, which tells me that "the theme is currently not activated on your site as the default theme", even though it's the currently selected theme.
I've set my permissions as per this page:
and have set /wp-content/themes/ to be group writable. I've also tried disabling all my plugins. Nothing so far has worked.
I'd like for my Themes tab to function properly, and for WP to recognize my chosen theme as the default theme. I can live without editing the theme within WP, but the rest should function properly.
Any ideas? Thanks in advance for any help.