I've found a pretty nasty bug in wp-super cache. There's an infinite redirect loop when you go to the "https" version of a blog.
For instance, https://wyday.com/blog never loads (after about 20 seconds you'll see a message saying it's redirecting in such a way that it will never load). The http version of the site loads perfectly: http://wyday.com/blog,
When I disable wp-supercache this problem goes away.