Trying to edit question causes 500 internal error

Hey, I noticed that if I try to edit a question I get 500 internal error. In PHP error log, I get 1 error and 1 warning for this action:

[Sun Oct 18 19:42:31 2015] [warn] [client xxx.xxx.xxx.xxx] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server, referer: http://site.com/community/question/question-title/
[Sun Oct 18 19:42:31 2015] [error] [client xxx.xxx.xxx.xxx] Premature end of script headers: index.php, referer: http://site.com/community/question/question-title/

I have base.php and question.php modified. But, I did disable anspress folder from theme folder to remove customizations to test. Error still present.

Are there any specific server settings that might cause this?