I've discovered there's some sort of bug that was in early versions of Microsoft Live Writer. I checked on the Live Writer forum and followed the recommendation to upgrade to the latest version.
Voila! I'm now posting like a good 'un.
So my apologies to Blogger, things are working fine now and it wasn't your fault at all.
I've a Gary Halbert copywriting piece that I had ready to post that got lost and so I'm just going to redo it and post later.