I had a short dawn/dusk effect, then after installing the hotfix it was normal (it stayed normal after the patch as well). I just re-installed so I could check something in v1.29, then re-installed the patch, and got an instant day to night transition. Since some people can gain or loose dawn/dusk by installing the patch, you could try re-installing the patch again, or un-installing game and then re-installing the game and patch (backup your savedgames folder first, just in case). May be worth a shot, anyway.