When viewing:

https://siteurl/index.php?module=CoreHome&action=index&idSite=23&period=range&date=previous7&updated=1#?idSite=23&period=range&date=previous7&category=Dashboard_Dashboard&subcategory=1

I get the warning message:

WARNING: /var/www/siteurl/vendor/twig/twig/lib/Twig/Loader/Filesystem.php(35): Warning - realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/var/www/siteurl) - Piwik 3.2.0

Looking at where Twig_Loader_Filesystem is used, the $rootPath parameter is not passed to the constructor, so it falls back to the current working directory (which happens to be outside of the basedir for the PHP installation).

PHP Version: 7.0.19-1
Piwik Version: 3.2.0

I can provide more information if needed.