WebDAV sync with mydisk.se fails

odin
After having read elsewhere that Zotero works will with http://mydisk.se I just opened an account there and tried to sync my library. However, verifying the connection fails.

When I try to open the "/zotero/"-folder directly via Firefox the login-window keeps respawning, without ever accepting the valid credentials, so it appears as if http://mydisk.se could not handle logins when "/zotero" is appended to the URL to login to.

Since it seems to work for everyone but me, I just thought I should ask if anyone fares better or has had similar problems and could solve them.

Just to ease debugging, I'm running Firefox 3.5.2 (Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2); and here is the output from Zotero's log:

(3)(+0000000): Verifying storage

(3)(+0000001): HTTP OPTIONS for https://grum334a:********@mydisk.se/grum334a/zotero/

(3)(+0000351): ===>200<===(number)

(3)(+0000000): Date: Wed, 19 Aug 2009 16:05:24 GMT
Server: Apache
DAV: 1,2, <http://apache.org/dav/propset/fs/1>
MS-Author-Via: DAV
Allow: OPTIONS,GET,HEAD,POST,DELETE,TRACE,PROPFIND,PROPPATCH,COPY,MOVE,LOCK,UNLOCK
Content-Length: 0
Keep-Alive: timeout=2, max=999
Connection: Keep-Alive
Content-Type: httpd/unix-directory


(3)(+0000000):

(3)(+0000000): ===>200<===(number)

(3)(+0000000): HTTP PROPFIND <?xml version="1.0" encoding="utf-8" ?>
<D:propfind xmlns:D="DAV:">
<D:prop>
<D:getcontentlength/>
</D:prop>
</D:propfind> to https://grum334a:********@mydisk.se/grum334a/zotero/

(3)(+0000064): <?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:" xmlns:ns0="DAV:">
<D:response xmlns:g0="DAV:">
<D:href>/grum334a/zotero/</D:href>
<D:propstat>
<D:prop>
<g0:getcontentlength/>
</D:prop>
<D:status>HTTP/1.1 404 Not Found</D:status>
</D:propstat>
</D:response>
</D:multistatus>


(3)(+0000000): ===>207<===(number)

(3)(+0000000): HTTP PUT '' to https://grum334a:********@mydisk.se/grum334a/zotero/zotero-test-file

(3)(+0000065): <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>401 Authorization Required</title>
</head><body>
<h1>Authorization Required</h1>
<p>This server could not verify that you
are authorized to access the document
requested. Either you supplied the wrong
credentials (e.g., bad password), or your
browser doesn't understand how to supply
the credentials required.</p>
<hr>
<address>Apache Server at mydisk.se Port 443</address>
</body></html>
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