Never seen that before and I've been working with EEPC for 4+ years now. If the file saved successfully on the drive while the machine was unlocked it should be there after a reboot. Now if its caching the data and not actually writing it until after windows begins shutting down I could see that possibly being a problem..but thats not very likely.
me neither. EEPC doesn't know anything about files so it's unlikely it could do something as specific as stop a file being written - I would tell the customer to speak to BitReplica, looking at their website it doesn't seem to be doing anything unusual.