[Plugin: WP Super Cache] No closing html tag. Not caching.

I’m running a NGINX dev server and having problems getting WP Super Cache to load on my wordpress network. I have turn on debugging and disable every single plugin, checked the theme for closing html, but still getting the same error messages. Is there anything I’m missing, maybe the options in my PHP config such as output_buffering, zlib compression.

Error Message:
02:09:56 / Cookie detected: wordpress_logged_in_f3
02:09:56 / supercache dir: /*/feed/
02:09:56 / No wp-cache file exists. Must generate a new one.
02:09:57 / Cookie detected: wordpress_logged_in_f3
02:09:57 / In WP Cache Phase 2
02:09:57 / Setting up WordPress actions
02:09:57 / Supercache caching disabled. Only using wp-cache. Non empty GET request.
02:09:57 / Created output buffer
02:09:58 / Output buffer callback
02:09:58 / Buffer is blank. Output buffer may have been corrupted by another plugin or this is a redirected URL. Look for text ‘ob_start’ in the files of your plugins directory.
02:09:58 / No closing html tag. Not caching.
02:09:58 / wp_cache_shutdown_callback: collecting meta data.
02:09:58 / Sending ‘Content-Type: text/html; charset=”UTF-8″‘ header.
02:09:58 / Did not write meta file: wp-cache-feeded46d183b3201da133143f5ac6d89ab8.meta ** *0* **

http://wordpress.org/extend/plugins/wp-super-cache/