Several cache issues are known. As a temporary fix, please disable Global Configuration - System Cache and the plugin System - Page Cache.
Blank page, error in Multilingual and HTTPS sites.
This pertains only to Joomla! version(s): 3.7.0
What is the cause
How to fix
Disable the plugin System - Page Cache
Disable the Global Configuration - System Cache
This is a known problem that will be fixed in the next release: https://github.com/joomla/joomla-cms/pull/15592