Xibo disrupts other virtual host by rewriting

Since I start to try to install xibo web version 1.8, pages on my otyher virtual hosts are changed to …/install/ on random pages that should be …/index.html.

DocumentRoot /srv/www/vhosts/xibo.robkalmeijer.nl/httpsdocs/web/
<Directory “/srv/www/vhosts/xibo.robkalmeijer.nl/httpsdocs/web/”>
Options +Indexes +FollowSymLinks
AllowOverride All
Order allow,deny
Allow from all

The files are unpacked in the /srv/www/vhosts/xibo.robkalmeijer.nl/httpsdocs/ directory.

Earlier attemps to install resulted in blank pages on the browser.