Hi,,
I use WP Super Cache from month, and no problem, but yesterday I found strange thing. I got this message!
Warning! /home/...../public_html/ is writable. Please make it readonly after your page is generated as this is a security risk.
And I know the default Permissions are:
public_html: 750
Files: 644
directories: 755
And that's Permissions in my site.
http://img30.imageshack.us/img30/4542/5302009105222.png
I think that's a bug in wp super cache,
Regards..