Getting 500 errors when adding new question. Why?

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My server is throwing 500 errors whenever I try to add a new question. This issue is happening on multiple subdomains of mine, and I have already checked the file permissions, and replaced the post-new.php with the default one. I have also tried deactivating all other plugins, and the plugins I am using are up to date. The error it is throwing me is below:

[Tue Sep 29 18:25:07 2015] [error] [client 173.227.74.5] Premature end of script headers: post-new.php, referer:http://asdf.chatterhorn.com/wp-admin/
[Tue Sep 29 18:25:25 2015] [error] [client 173.227.74.5] Premature end of script headers: post-new.php, referer:http://asdf.chatterhorn.com/wp-admin/
[Tue Sep 29 18:27:22 2015] [error] [client 173.227.74.5] Premature end of script headers: post-new.php, referer:http://asdf.chatterhorn.com/wp-admin/
[Tue Sep 29 18:27:40 2015] [error] [client 173.227.74.5] Premature end of script headers: post-new.php, referer:http://demo.chatterhorn.com/wp-admin/

 

Any ideas on why this might be happening and how to fix it?

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As I said before AnsPress is not tested with multisite, and it may not work with multisite. But I would like to investigate the issue. Will you confirm that this error is not caused by other plugin, disable all plugin and then try.