Hello Friends,
Today i got a major problem in my wordpress blog. Post Editor was not working in my blog. I try to resolve this problem with many methods. Finally i resolve this problem from adding a simple code on my blog's WP-CONFIG file. That file available at the main directory of WordPress Blog. For more information watch this video.
Add following line into your WP-CONFIG file to solve your issue.
define('CONCATENATE_SCRIPTS', false );