Not sure if it's just me, but I believe I've found a bug.

For some reason if i load or play a game with the "bright/cloudy" backdrop (the one you get in the advanced interface tutorial) it gets "stuck" as the only backdrop that comes up in any new maps.

Upon a post on this a dev told me to check the "use coloured skyboxes" and "use deepspace skyboxes." Both of these were already checked.

So I experimented. I exited out of the game then restarted it. I then when into the effects options and unchecked both options and then re-checked them. Now when I started a new sp game I had finally a new skybox, however if I simply uncheck and recheck either options in the effects menu during a game (if it isn't a game from a save file) it just seems to switch between skyboxes upon doing so and the options don't always stick. IE - if I uncheck "use coloured skyboxes" it might switch the backdrop to that cloudy looking one, or to a black deep space looking one, then upon rechecking it it switches it again, the same thing goes for unchecking/rechecking the "use deep space skyboxes." It's like the options don't stay selected for me or just randomly work.

However once I save a game, then load it, the backdrop will stay at whichever one it was at upon saving, and unchecking/rechecking either option doesn't change it like it does if it's a new game and not loaded from a save.

My specs are:
Amd 64 3400
2gb ram
Nvidia 6800 ultra w/ 169.21 drivers
Windows XP w/SP2