One of the problems with this issue is that when users attempt to log into our website, they are greeted with a blank page. That is usually the issue that results in a call or email from our client, after which I check the admin page of FileMaker and notice that the Database server is no longer talking to the Web Publishing server.
After enabling error logging in the PHP.ini file, I am seeing this error:
Fatal error: Call to undefined method FileMaker_Error::getRecords() in C:\inetpub\wwwroot\index.php on line 64
I will report back to see if this error goes away when the servers are talking to one another.