When I updated TheCartPress plugin I ended up with a white screen with the following error message.
Fatal error: Cannot redeclare tcp_the_add_to_cart_button() (previously declared in /home/content/t/h/c/thccooking/html/wp-content/plugins/thecartpress-dynamicoptions/templates/tcp_dynamic_options_templates.php:205) in /home/content/t/h/c/thccooking/html/wp-content/plugins/thecartpress/templates/tcp_buybutton_template.php on line 33
I deleted TheCartPress plugin via ftp and still the site wouldn't come back up. I deleted all CartPress plugins and the site then came our of Fatal error mode.
I then reinstalled TheCartPress plugin and then each additional CartPress plugin one at a time. The site stayed up and works fine. It's just the automatic update feature really screws things up.