Is your Web Host listed here? >>> http://www.ait-pro.com/aitpro-blog/3576/bulletproof-security-pro/custom-php-ini-faq/#web-hosts-list
If so, click on your Host's link to go to specific custom php.ini setup instructions by Host. Also 10 new Web Hosts have not been added to the list yet. If you do not see your Web Host listed then please send an email to info[at]ait-pro[dot]com. We will be glad to log into your site and fix the issue.
Error Log Path Seen by Server: (BLANK) is usually either:
1. When you created your custom php.ini file the error_log = directive does not contain the path to your php error log file. Check your custom php.ini file to ensure the error_log = directive is not (BLANK).
2. The custom php.ini file was not created successfully or correctly for your particular specific Web Host.
3. Your Web Host does not allow you to create custom php.ini files.
General Help info is also contained in the Htaccess Protected Secure PHP Error Log Read Me help button, but this could be a Host specific issue.
Troubleshooting and Possible Problems
If you have done everything correctly then the Error Log Path Seen by Server: should display the same exact path that you see in the PHP Error Log Location Set To: window. BPS will display an error warning message if a valid path to your BPS PHP error log has not been added to your custom php.ini file by comparing the PHP Error Log Location Set To: path to the Error Log Path Seen by Server: path. If your custom php.ini file is not really being seen by your Web Host Server then you will see that the Error Log Path Seen by Server: path is either blank or you may see error_log or you may see a completely different folder path then the path in the PHP Error Log Location Set To: window. A custom php.ini help link is provided on the P-Security Help and FAQ page - General php.ini Info and Host Specific php.ini Information. This link contains specific custom php.ini set up steps by web host.
Regarding using the PHP Error Log test button. If your custom php.ini file is set up correctly then you would see that php error test logged in your php error log file. Since the custom php.ini file does not appear to be set up correctly the php error test will not be logged and only displayed to you.