I have no idea unfortunately. Maybe you could register on ensembles forums and tell them that maybe the save path is messed up and you need to check to make sure it's pointing to the right place and could they tell you what file you need to edit.
They probably won't answer tho :/
The only thing I can say to do really is to remember what the drive letter was when it was working and make sure that path is still there (which I suppose it isn't if it's not saving)
I'll see if I get a reply and let you know