When I open the Facebook app as a pen window it works fine when the app is open. As soon as I minimize Facebook there is a white box taking up the entire screen, I can move the box around the screen to show more of the screen however the only way that I know of to get rid of it is by closing Facebook. This issue does not occur with other apps in pen window. Any ideas? Also every time that I start up my tablet I have to re-login to Facebook. Any ideas as to a solution or at least why this is happening? SM-p600 Wi-Fi only, stock touchwiz 4.4.2 most recent KitKat update. I just noticed this problem today.