Webpaths are not set in any Form-Tag - Saving Forms (zone, banners, etc.) not working

[OMG]

Hello Revive-Community,

I have an issue with my revive installation. I cant save any forms. 

The Revive installation is working on the following URL:  www.domain.de/openx/

My webpaths are set like this:

[webpath]
admin="www.domain.de/openx/www/admin"
delivery="www.domain.de/openx/www/delivery"
deliverySSL="www.domain.de/openx/www/delivery"
images="www.domain.de/openx/www/images"
imagesSSL="www.domain.de/openx/www/images"

Almost everything is working except saving the data (banner, zones or settings) in the admin panel.

I figured out what's the problem but I have no idea how to resolve it.
The main problem you can see in the image. The webpath/baseurl is not considered in the action of any form element in the admin panel. 
It seems that this is a bug but maybe its just a setting, can someone help me out?

Edit/Update: Revive adds the form URL like this. It seems actually that the webpath is not considered.

$this->oTpl->assign('formUrl', $_SERVER['SCRIPT_NAME']);