Hallo Patrik,
Forbidden
You don't have permission to access / on this server.
Aus der Apache-Doku http://httpd.apache.org/docs/mod/mod_rewrite.html:
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Note: To enable the rewriting engine for per-directory configuration files you need to set RewriteEngine On'' in these files and
Options FollowSymLinks'' must be enabled. If your administrator has disabled override of FollowSymLinks for a user's directory, then you cannot use the rewriting engine. This restriction is needed for security reasons.
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Füge in die .htaccess ein
Options +FollowSymLinks
ein. Wenn das klappt, prima, wenn nein, wende Dich an Deinen Hoster.
Viele Grüße,
Christian