kingary on "[Plugin: Jetpack by WordPress.com] 500 Internal Server Error"

I'm having 500 errors on three pages that have embedded audio Jetpack shortcodes.

http://ourenglishclass.net/class-notes/literature/selections/romeo-and-juliet/soundtrack-project/
http://ourenglishclass.net/class-notes/literature/selections/romeo-and-juliet/soundtrack-project/easy-songs/
http://ourenglishclass.net/class-notes/literature/selections/romeo-and-juliet/soundtrack-project/hard-songs/
As with renatorm's seemingly identical problem, the following had no effect:

de-activating others plugins
changing the theme
de-activating Jetpack shortcodes module
re-installing to WordPress 3.7.1 did not fix it
The server error logs:

[Sat Nov 30 15:29:09 2013] [error] [client ###.###.###.##] Premature end of script headers: index.php
[Sat Nov 30 15:29:09 2013] [error] [client ###.###.###.##] Premature end of script headers: index.php
These pages are for a student project so timely help would be much appreciated.