post-new.php blank page

I am guessing you are using a lot of plugins or some plugins are taking a lot of memory. White page normally means the PHP memory has exhausted. https://codex.www.ads-software.com/Common_WordPress_Errors

Check your logs for the current error and in the mean time try increasing your memory limit https://docs.woothemes.com/document/increasing-the-wordpress-memory-limit/

And yes, this has nothing to do wrong the plugin. The plugin works perfectly with WordPress 4.0.1.

FYI: the plugin doesn’t touch anything related to your wp-admin posts.