Robert, one additional thing to check...
/etc/httpd/conf.d/php.conf may have the following in it:
Found something
<Files *.php>
SetOutputFilter PHP
SetInputFilter PHP
LimitRequestBody 524288
</Files>
replace above lines with
AddType application/x-httpd-php .php
This is from another post in the forums (do search on "524288").
Hardware and performance
Server Loads
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