Breaks FB

It was working fine before. Now it breaks FB crawler

https://developers.facebook.com/tools/debug
Response Code: 206
Can’t Download: Could not retrieve data from URL

Users can still read the site.
Even with plugin disabled it is like that. The changes in .htaccess are to blame.

Not sure what happened the last 2 weeks that caused this.

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