Problems viewing pages harvested with login/password (no-type as mimetype)

Successful harvest at finanswatch.dk can not be rendered as text/html through viewerproxy.
This site is harvested through login and password. Unprotected pages are rendered as normal as text/html - just like on the living web - whereas the protected pages harvested are shown as text/plain. These pages are thus shown like "page source". An arc file tells that it is harvested as "no-type".
Copying the content to a file suffixed .html shows a "normal" page with style sheet colors text size etc.
Apparently we can continue to harvest valuable pages just not show them.
This harvest is done on PLIGT-Netarkivet.
This rendering problem might be in viewerproxy.