WordPress 3.6 plugin Errors

I have installed “floating Social Bar” ( a famous social plugin) for my wordpress blog. ( https://knowledgethristo.com/ ). It isn’t working correctly. Kindly check at your side. Actually after the installation of wordpress 3.6 everything is not working correctly. My post editor got vanished. Currently I’m using a plugin for writing a post. I thought I should install it manually so that it might work, but nothings happens.. I installed wordpress 3.6 manually through FTP Client. But the problem remained the same. Can anyone here help with this. I also have called my hosting company for this problem, They are also looking into it.