In Views:
1) a Global text field is output as a custom link like this (see screenshot):
/node/add/content_type ...
2) the dropbutton uses this field
The first part of the custom link "/node" gets cut off. So the link in the dropbutton results in a page not found, because it references "/add/content_type ..."
(If the link is created as /node/node/add/content_type then it works)
