Hi, Matthew . I'm going to try to do a bit of information gathering and see if we can start puzzling this out. First of all, if you could go to <a href="http://supportdetails.com/" rel="nofollow">http://supportdetails.com/</a> and post the information here (minus the IP address, of course!). Were you, by any chance, logged in continuously over the time period you were working on these maps? In the past, we've seen issue where people have lost work due to being disconnected from the servers. There's a message that's supposed to pop-up when that happens, however.