WordPress is a great tool. So are weblog editors that use XML-RPC and the metaWeblog API.
My weblog editor was failing. Finally tracked it down to truncated XML-RPC messages.
This *never* happened on my other machine (not Server)
After much chasing I have discovered that if *any* of my sites has the Performance Cache enabled the XML-RPC messages get truncated. Sigh.
For now, no Performance Cache for me.