Well, let's not get too optimistic yet <s>...

I did change the way the guid is generated and I suspect that that may have been the problem. But let's wait it out for another few posts. It certainly appears to not double up immediately so that's at least a good sign.

Thanks everybody. But lets wait with more comments here until further posts are made.

Martin, as I mentioned I changed the GUID scheme so this may result now in duplicates of old posts.

It's good to see only one post arrived of the new test entry and that's a good sign that possibly the new GUIDs are working where the old ones didn't. However, it's also possible that it works because the entry is very short and doesn't use Word's HTML markup - IOW, the markup is way simple. Next post that gets made will be a 'normal' post and we'll see how that fares <s>...