Thread:Project:Support desk/How to avoid user welcome bla, bla, bla?

On a wiki I unsuccessfully try to return users to the very page they started out with their user registration by adding:. So what happens: After registration the user gets returned to Special:UserLogin showing "Welcome, username" and below some bla, bla, bla together with a link "Return to 'the page you last visited'" and there is no direct return to the original page. On e.g. German Wikipedia I get directly to the original page. Does anyone know the trick to get MW obeying the "returnto" parameter instead of ignoring it in a way?