500 when trying to save settings

[choccyness]

can you post the .htaccess-file?

Sure:

Code:

#
# GetSimple CMS htaccess ROOT file
# apache 2.4
#

# The following require certain allow overrides, if getting 500 error comment them out one by one
# can be resolved in apache httpd.conf to ensure security alternatives

# override charset
AddDefaultCharset UTF-8

# prevent directory listings
Options -Indexes

# Follow symbolink links, This is required for rewrites on some hosts
Options +FollowSymLinks

# Set the default handler.
DirectoryIndex index.php

# blocks direct access to the XML files - they hold all the data!
<Files ~ "\.xml$">
    <IfModule !mod_authz_core.c>
        Deny from all
    </IfModule>
    <IfModule mod_access_compat.c>
        Deny from all
    </IfModule>
    <IfModule mod_authz_core.c>
        <IfModule !mod_access_compat.c>
            Require all denied
        </IfModule>
    </IfModule>    
</Files>

<Files sitemap.xml>
    <IfModule !mod_authz_core.c>
        Allow from all
    </IfModule>
    <IfModule mod_access_compat.c>
        Allow from all
    </IfModule>
    <IfModule mod_authz_core.c>
        <IfModule !mod_access_compat.c>
            Require all granted
        </IfModule>
    </IfModule>    
</Files>

# handle rewrites for fancy urls
<IfModule mod_rewrite.c>
    RewriteEngine on

    # Usually RewriteBase is just '/', but
    # replace it with your subdirectory path
    RewriteBase /example.com/

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule /?([A-Za-z0-9_-]+)/?$ index.php?id=$1 [QSA,L]
</IfModule>