[Plugin: Post From Site] Post from site plugin not submits user posts

I setup POST FROM SITE plugin successfully, but the problem is, whenever any user submit the post, then it will not move ahead, rather than a “connecting..” shows in address bar of browser (firefox, chrome, safari). I use Cloudflare cdn + Minify plugin+ w3Total cache plugin. Any help?

http://wordpress.org/extend/plugins/post-from-site/