Hi,
Sorry for the issues you are having.
I visited your site and see what you mean. I get blank screens for both links.
This sounds like a php conflict.
Can you please turn on the WordPress Debug to see if we can get more information.
Please follow the steps in the WordPress Debug Codex in the Example wp-config.php for Debugging section:
http://codex.wordpress.org/Debugging_in_WordPress
Please place that coding and load those two pages and then check the error log and see if there are any errors.
Let me know what you find out and we can go from there.
Thanks