I seem to have done something unbelievably dumb - I've somehow deleted the scenery folder from Addon Sceneryscenery. Could someone please tell me how to fix? It can't be as simple as creating a new folder?

Yes it's just as simple as recreating the folder. Or, go into the scenery library and remove the checkmark for addon scenery (disable). You won't need it unless you of course add scenery but it will have to be disabled in your scenery.cfg or through the scenery library or it could cause problems.Jim

Many thanks for such a swift reply. Yes, I do add lots of scenery, so I'll create that new folder - and pray!