Mornin, thanks for that. I've tried again today and its now pointing to my root arma folder (both alive and Deniland). Everything else (CBA and CUP) is still on D:. I'm not going to leave it for a time as it is a big map.

If you've got time, can you fill me in on what its actually trying to do when 'generating sector data'? Is it going through every building on the map or every town / city defined in the maps config or something? Just so I can guess how long it might take to do this map (2 minutes or 1 hour etc).

Thanks for everything you've done so far.