Hi @sblumensaat,
Sorry to hear of the problem you are having.
Can you please try temporary enabling WP_DEBUG mode? To do this, just go to wp-config.php include this:
define('WP_DEBUG',true);
You might already have a line for WP_DEBUG, so just make sure it’s set to true.
Let me know what errors if any you are getting when you get white screen.
Please try deleting and reinstalling the latest version of theme.
Also please make sure you are using latest version of PHP on your server by referring the information provided in the following pages.
https://www.wikihow.com/Check-PHP-Version
http://php.net/supported-versions.php
If nothing works for you then would you mind if I log in to your site and do some troubleshooting? If this is ok then could you please temporary share me your site admin log in details privately by adding them in the box having text “Enter your private content here (only you and forum moderators will be able see it)”?
Best regards,
Shufflehound team