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blank page = server500 error - check apache error log - most likely is not meeting specs or php memory_limit too low.
System Requirements:
Apache 2.x or Microsoft IIS 7
PHP support for the SQLite PDO driver
PHP support for the MySQL PDO driver
MySQL (5.0.4 or higher) with InnoDB support
PHP support for PDO
PHP support for GD2
PHP 5.3.x and above
Please search forums before posting. Please make sure your post includes the version of the CMS you are using and a link to the problem. Annotations on screenshots can also be helpful to explain problems/goals. Please use the "secure" tab for confidential information.
For me, the solution had nothing to do with server settings, rather.... JCEditor.
I too was getting a blank page when trying to access the template's settings
(Oculus 1.2, Gantry 4.1.19, Joomla 2.5.16, PHP 5.3.9, MySQL 5.0.96-community, Apache 2.0.64)
Uninstalling JCEditor (v. 2.3.3.2) fixed it, and the latest JCEditor v 2.3.4.1 seems not to cause the problem.