We haven't been able to duplicate it reliably, but it's definitely something we'll be looking into again after the 19th, when we're spending a couple of weeks in intensive polish and bugfixing mode. I can appreciate it's really annoying -- same to me -- but typically the saves that people report as incomplete show up as complete when we load them on our development workstations. Or at least that was the case last time we looked at this, months ago, before the 4.0 upgrade. Hopefully this will be less elusive this time!