I'm not sure why it would be showing a blank page unless output buffering is occuring and the the browser is just waiting for the script to show everything before loading anything. I have also experienced server 500 errors when I enter PHP values into the .htaccess files instead of a local php.ini file.
The catalog cleaner switches it off because is can cause problems with the Mozilla browser when trying to show a steady output of data.
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X-Cart Pro 4.5.5 Platinum
X-Payments 1.0.6
PHP 5.3.14
MySQL 5.1.68
Apache 2.2.23
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