As soon as I activate WP Super Cache, all pages in my /blog directory are blank & white. I have to SSH in and delete all its files to get things working again. Yes, I read the instructions about removing a couple items before activating.
The behavior leads me to suspect it is an htaccess issue. WP is installed in a subdirectory at sitename.com/blog, and there are htaccess files at sitename.com/ and at sitename.com/blog/. Which one, or both, should have the htaccess modifications applied? Do they need to be modified to accommodate the fact that WP is in a subdirectory?