Incompatbility: Hyper Cache's "Use readfile()"

```
From a forum thread:

https://wordpress.org/support/topic/after-last-update-plugin-doesnt-work?replies
=7#post-6665981

Workaround is to disable the setting.
```

Original issue reported on code.google.com by `dylankk...@gmail.com` on 9 Mar 2015 at 3:41
