BUG - Direct link to files created via /media API call return a corrupt URL!

I noticed that direct links generated via the /media API are currently returning a corrupt URL. Not all file formats seem to be affected, but I can reproduce the issue for PDF and Office files.
According to the documentation, the returned JSON should look like this:

{
    "url": "https://dl.dropboxusercontent.com/1/view/abcdefghijk/example",
    "expires": "Fri, 16 Sep 2011 01:01:25 +0000"
}

However, currently the following JSON is returned:

{
    "url": "https://api-content.dropbox.com/1/files/auto/abcdefghijk/example.pdf?signature=1.uJpbEgcWOjAIBQ..1435610003.qbYUOzANtu_33g6uv6dJy0JcV9tjp-oF8nQCci_h2Mg",
    "expires": "Fri, 16 Sep 2011 01:01:25 +0000"
}

The url however is invalid and give the following error:

{"error": "Signature did not match. STRING_TO_SIGN was u'1\\nuJpbEgcWOjAIBQ\\n\\n1435610160\\napi-content.dropbox.com\\nGET\\n/1/files/auto/abcdefghijk/example.pdf'"}

Has something changed in the API or is it a (quite severe) bug. If the /media call has changed, where can I find more information about this?