how to avoid white in the distance after alt + tab

Sometimes I need to alt + tab out of the game to do stuff, and I've noticed that after doing this the distant view turns completely white. For example in stormwind where the boats are, the background in the distance on the horizon goes white and this even reflects on the water, it doesn't look right, specially at night.
Usually it's a darker colour or at least something that looks like it belongs there depending of the time of day in game.
What can I do about this? The only way I know to deal with it is to quit the game and launch it again.
I am playing on windows 8.1 with most recent updates from windows update. I use an nvidia gtx 690 graphics card. I play the game full screen at 2560 x 1600 with all the settings at ultra.
Here are some screenshots of the anomaly
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How to safely Tab out of a game?
You can see this in action when you have a game running in full-screen, exclusive mode. If you Alt+Tab out of it, you can hover over the game's taskbar icon or press Alt+Tab again. You won't see a preview of the game's display area like you would for other windows.What to do when you cant Alt Tab?
Let's begin troubleshooting!Can t Alt Tab out of game Windows 10?
The fix is to disable it. To do this, right-click on the Taskbar, hover your mouse cursor over the News and Interests section, and select the Turn off option. The Alt+Tab feature should now be working normally (I'd also try rebooting, just because that's sometimes the magic cure-all for Windows).Why does my PC take so long to alt tab?
It's more than normal that some programs/games take longer than others to ALT+TAB, as your making it go to the background processes and then focusing them again. The only way to 'fix' this is increasing your PC overall performance or closing non-used programs to make it focus it's power on the games.How to Fix | Alt + Tabbing Out Of Games Screen Turns Black For 2-3 Seconds
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Images: Tatiana Syrikova, Vlada Karpovich, Ketut Subiyanto, Vlada Karpovich