Shopware geht nicht mehr - 404 File Not Found

Hallo

Immer wenn ich auf die Shopware Hauptseite zugreifen will kommt folgende Meldung: 404 File Not Found

access.log 

127.0.0.1 - - [31/Jul/2017:11:54:20 +0200] "GET / HTTP/1.0" 404

127.0.0.1 - - [31/Jul/2017:11:51:45 +0200] "GET /eula.txt HTTP/1.0" 200

Zugriff auf eula.txt funktioniert und zeigt die Datei an, also vermute ich auf ein .htaccess Problem.

Wenn ich im Hauptverzeichnis eine HTML Testseite anlege (index.html) erscheint diese auch problemlos.

htaccess:

<IfModule mod_rewrite.c>
RewriteEngine on

#RewriteBase /shopware/

# Https config for the backend
#RewriteCond %{HTTPS} !=on
#RewriteRule backend/(.*) https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

RewriteRule shopware.dll shopware.php
RewriteRule files/documents/.* engine [NC,L]
RewriteRule backend/media/(.*) media/$1 [NC,L]

RewriteCond %{REQUEST_URI} !(\/(engine|files|templates|themes|web)\/)
RewriteCond %{REQUEST_URI} !(\/media\/(archive|banner|image|music|pdf|unknown|video)\/)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ shopware.php [PT,L,QSA]

# Fix missing authorization-header on fast_cgi installations
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
</IfModule>

<IfModule mod_alias.c>
    # Block access to VCS directories
    RedirectMatch 404 /\\.(svn|git|hg|bzr|cvs)(/|$)

    # Restrict access to root folder files
    RedirectMatch 404 /(composer\.(json|lock)|README\.md|UPGRADE\.md)$
</IfModule>

# Staging environment
#SetEnvIf Host "staging.test.shopware.in" SHOPWARE_ENV=staging

# Development environment
#SetEnvIf Host "dev.shopware.in" SHOPWARE_ENV=dev
#SetEnv SHOPWARE_ENV dev

DirectoryIndex index.html
DirectoryIndex index.php
DirectoryIndex shopware.php

# Disables download of configuration
<Files ~ "\.(tpl|yml|ini)$">
    # Deny all requests from Apache 2.4+.
    <IfModule mod_authz_core.c>
          Require all denied
    </IfModule>

    # Deny all requests from Apache 2.0-2.2.
    <IfModule !mod_authz_core.c>
        Deny from all
    </IfModule>
</Files>

# Enable gzip compression
<IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE text/html text/xml text/plain text/css text/javascript application/javascript application/json
</IfModule>

<Files ~ "\.(jpe?g|png|gif|css|js|woff|eot)$">
    <IfModule mod_expires.c>
        ExpiresActive on
        ExpiresDefault "access plus 1 month"
    </IfModule>

    <IfModule mod_headers.c>
        Header append Cache-Control "public"
        Header unset ETag
    </IfModule>

    FileETag None
</Files>

# Match generated files like:
# 1429684458_t22_s1.css
# 1429684458_t22_s1.js
<FilesMatch "([0-9]{10})_(.+)\.(js|css)$">
    <ifModule mod_headers.c>
        Header set Cache-Control "max-age=31536000, public"
    </ifModule>

    <IfModule mod_expires.c>
        ExpiresActive on
        ExpiresDefault "access plus 1 year"
    </IfModule>
</FilesMatch>

# Disables auto directory index
<IfModule mod_autoindex.c>
	Options -Indexes
</IfModule>

<IfModule mod_negotiation.c>
    Options -MultiViews
</IfModule>

<IfModule mod_php5.c>
#  php_value memory_limit 256M
#  php_value max_execution_time 120
#  php_value upload_max_filesize 20M
   php_flag phar.readonly off
   php_flag magic_quotes_gpc off
   php_flag session.auto_start off
   php_flag suhosin.session.cryptua off
   php_flag zend.ze1_compatibility_mode off
   php_value always_populate_raw_post_data -1
</IfModule>

#   AddType x-mapp-php5 .php
#   AddHandler x-mapp-php5 .php

<IfModule mod_headers.c>
    Header append X-Frame-Options SAMEORIGIN
</IfModule>

Im vhost steht Allowoverride auf all:

<Directory /var/www/DIR/>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride All
                Order allow,deny
                allow from all
</Directory>