AtomAPI broken

I'm getting "The URI for this AtomAPI request is given in an incorrect format" since the last changes to ATOM API on LJ (~5/4/2005).

POST /interface/atom/post HTTP/1.1
Host: www.livejournal.com
User-Agent: DBlog.NET/1.0
Content-Type: application/x.atom+xml
Content-Length: 479
Connection: Keep-Alive

... valid xml ...

I get back

400 - Bad Request
Bad Request
The URI for this AtomAPI request is given in an incorrect

Ideas?
Thx
dB.