Best Answer rijans , 20 March 2014 - 07:54 PM
Finally found the cause of the issue! Any plugin that loads "Head JS" (don't know about this!) makes this problem.
Such plugin devs said, it will make my site faster, so I used it. BTW after deactivating it, DMS editor again loads as before!
Such plugin example>> http://wordpress.org.../headjs-loader/
And sorry for the late reply!Go to the full post