[MusicMan]

Originally Posted by Ramsesx

3. Don't know what you mean, use it only for the zoints default settings + Rewrite URLs and insert keywords, (using mod_rewrite).
Thanks again.

Ok, I'm not 100% sure of what all you're needing to do with your rewrites but here's what I see.

http://mc-escort.de has a PR0
http://www.mc-escort.de has a PR3, so it makes sense to go ahead and redirect to http://www instead of to http://

So, backup your current htaccess and give this one a shot. Replace everything you posted above with the following.

Options +FollowSymlinks
RewriteEngine on
RewriteCond %{HTTP_HOST} ^mc-escort\.de
RewriteRule ^(.*)$ http://www.mc-escort.de/$1 [R=permanent,L]
RewriteRule ^([a-z0-9_\-]*-(f|all)[0-9]+(p[0-9]+|/index[0-9]*)?\.html)$ forumdisplay.php/$1 [QSA,L]
RewriteRule ^([a-z0-9_\-]*-(t|p)[0-9]+(p[0-9]+|/index[0-9]*)?\.html)$ showthread.php/$1 [QSA,L]
RewriteCond %{REQUEST_URI} !(index\.php|\.css) [NC]
RewriteRule ^(archive|sitemap)/(.*)$ $1/index.php/$2 [QSA,L]

It may or may not work exactly like you're wanting, but it's worth a shot. Let me know if that fixes the /gallery redirecting to /forums.