I'm not the final authority, but I suspect that you've lost the work. Happens to nearly all of my machines (or at least the last couple that I still have running DF) once a week or so. Everytime a machine quits with a 910 error or invalid co-ordinates error, I put it on something else. Had 14 boxen running DF at the change over. Now have 2... Next week, probably none.