In my setup, I have wordpress in a subdirectory with these options:
WordPress Address: http://dougal.gunters.org/wordpress
Blog Address: http://dougal.gunters.org
The apache DocumentRoot for this vhost is: /var/www/vhosts/dougal.gunters.org
My permalink structure is: /blog/%year%/%monthnum%/%day%/%postname%
Which results in permalinks like: http://dougal.gunters.org/blog/2009/10/20/wordpress-2-9-media-embedding
I think this is confusing the Lockdown mode in Super Cache, because it wants me to make my wordpress subdirectory writable, but what it really needs is to have a blog subdirectory under my DocumentRoot.
Any ideas on how to handle this?