I’ve found tons of threads related to this being a lethal combination. You may see this realized as a blank page when trying to validate WPG2. The workaround is to add some code to your .htaccess file which will force php5.
AddType x-mapp-php5 .php
AddHandler x-mapp-php5 .php
You need to have this code in your .htaccess file in your root directory. If you don’t have a .htaccess file in your root dir then you need to make one (use notepad or some equivalent).