I'll do this, thanks.
As background though, this weekend I had completely re-installed my PC from scratch, including drivers and O/S, on re-formatted disks, so it should be pretty clean.
Also, I can consistently reload the earlier saves without problem, so it appears to be specific to this save, rather than the software.
I also recently had problems in another game (PTW) where someone could not load. We solved this by sending him the identical save through an email address different from gmail.
So I'm wondering if gmail is becoming a problem.
The other difference between now and before would be the addition of all the Win2k security patches, whereas previously I was just running on SP4.