The new version, 0.7, I am working on has more diagnostics related to backfill. It should be ready early next week.
However, other users who are on XP, have reported successful backfill. So it is not 64 bit as I thought initially (some users have tested on that platform), also it is not XP. I thought I had given you sufficient screenshots so that you could identify where it is failing in the operation. If the problem cannot be identified, it cannot be addressed. That is where it stands.