yes it could be anything but it was caused by the update. And no one has been able to help me find out how to see what the problem is.
As GJC Web Design said a blank page is a PHP error.
I : If you cannot modify the config, you should edit the configuration.php file in the Jomla root folder and set public $error_reporting = 'maximum';
So you have the answer.
But the error can be hide by the server config. You should see in your panel or php.ini, how to change the php error reporting.
If you dont know, then email to the server support. We cannot help you if we have no report. A blank page is the result, not the problem.
You are not a developper and cannot solve it ? Then you have to hire someone.
P.S: this is a help forum, no one get paid to help you in the forum, so please be cool.