I can't post anymore from Windows Live Writer with the current 2.5beta release (11-3-2008).
WindowsLive.Writer.CoreServices.XmlRpcClientInvalidResponseException: Invalid response document returned from XmlRpc server ---> System.Xml.XmlException: There are multiple root elements. Line 2, position 2.
<b>Fatal error</b>: Call to undefined function: printr() in xmlrpc.php</b> on line <b>1142</b>
WindowsLiveWriter,5984,Fail,00007,11-mrt-2008 19:14:05.828,"WindowsLive.Writer.Extensibility.BlogClient.BlogClientInvalidServerResponseException: Invalid Server Response - The response to the metaWeblog.newPost method received from the weblog server was invalid