Seems like some apache module is interfering with my request uris as it suffixes ".html" to it.
My rewrite log:
172.16.103.1 - - [08/Mar/2012:14:56:33 +0100] [www.example.org/sid#7ff723575b58][rid#7ff724b4fc58/initial] (1) pass through /folder/subfolder/
172.16.103.1 - - [08/Mar/2012:14:56:33 +0100] [www.example.org/sid#7ff723575b58][rid#7ff724b42468/subreq] (3) [perdir /srv/www/html/project/] add path info postfix: /srv/www/html/project/folder/subfolder.html -> /srv/www/html/trustedshops/folder/subfolder.html/
172.16.103.1 - - [08/Mar/2012:14:56:33 +0100] [www.example.org/sid#7ff723575b58][rid#7ff724b42468/subreq] (3) [perdir /srv/www/html/project/] strip per-dir prefix: /srv/www/html/project/folder/subfolder.html/ -> folder/subfolder.html/
This merely happens on our development servers. But It's hard do compare the whole apache config. Any ideas which module could be responsible?