I just tried a fresh install of EE 2.9.0 on a Media Temple DV account. Because of higher PHP requirements, I am running a FastCGI Application with PHP 5.3.28
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I am getting the following errors on my custom 404 page:
A PHP Error was encountered
Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/XXXXXXXXXXX/staging/XXXXXXX/expressionengine/controllers/ee.php:145)
Filename: core/Common.php
Line Number: 442
I am seeing the 404 page and the homepage, one on top of the other separated by this issue.