I've just had to re-install SG as everything went dark in my previous installation. During start up the brightness boost didn't kick in meaning all the maps were too dark to see - even the in game brightness control didn't work (it dumpes an error to the log each time I used it).
Things are working now but it was all a bit odd. Shortly before this happened I lost all my config too.
Weird but I'm back in the saddle now.