I installed Effortite Quickstart right now. This worked very well. (It's now just a testinstallation on a subdomain on my playground :) )
After logging in to the Backend I checked for Joomla!- and Extensions-Updates and installed them all, so the installation is completely up to date right now. (Joomla! 3.7.3, PHP 7.1)
When I open the Frontend ( effortite.7211.ch ) I receive an error called:
USING $THIS WHEN NOT IN OBJECT CONTEXT
At the same time I also installed Scrollite ( scrollite.7211.ch ) on another Instance of my Server and did the same, updating Joomla! and Extensions so it's the same Version as on Effortite.
There i've got no problem opening the Frontend.
Any help is appreciated