resize - WinRT Surface DirectX Black Screen -


i'm having strange , irritating problem on winrt surface tablet when using directx (hosted in backgroundswapchainpanel). once in while (like once day, or few times week / while testing few hours every day), half of 3d scene goes black, on picture below (cut vertically or horizontally):

http://www.zurawcli.vot.pl/dxproblem.jpg

while happens, directx still rensponsive , have full control of app. don't think posting code makes sense ( i'm using standard swapchain , resizing viewport , texture whenever screen size changes - getting screen size core window). happens once in while : ( when try explicitly force - splitting screen between 2 / switching between apps / , on, cannot repeat error - viewport resizes correctly. using app, happen.

did had experience similliar ? ideas causing ? in advance,

cheers


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