Per a blog entry at BoonEX: http://www.boonex.com/unity/blog/entry/Orca_displays_a_blank_page
Orca requires DOMXML and XSLT support. These PHP extensions are built in on version 5 but are not available in version 4. Almost 100% of Arvixe's servers run PHP 5 by default. However, if you are on an older server, the server default may still be PHP 4. To change the version of PHP that your account is running, login to cPanel and under PHP Configuration change the version from "System Default" to "PHP 5". It should resolve your issue.
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