Sometimes certain plugins or scripts can conflict with WordPress and cause errors which stop the your WordPress site loading properly. OptimizePress has been tested and will not cause your site to go blank, but often other plugins installed before or after OptimizePress can cause this to happen.
If you are presented with a blank screen, first try and go to your wordpress admin and deactivate all plugins. If you cannot get to your wordpress admin panel, you will need to manually use FTP to delete any plugins you have installed, and then add them manually one-by-one until you find the problem. If you don’t know how to use FTP, contact your hosting provider for help – or advise them of the issue and ask them to remove your active plugins.