I've occasionally seen error messages like that. First, try restarting WOFF. If you still get the error message, reboot the computer and try again. If that doesn't work, run Robert's backup program and restore your old settings (you may lose some pilot data if you haven't backed it up lately). Or, see if you can run JJJ's Mission Editor. I think his program also has a restore function. If all that doesn't work, you may have to consider reinstalling WOFF.