Not only do I have all the issues with alt-tabbing on load screens and have tried every solution, I have always used hidden windows taskbar and it now shows up when I am in game should I hover where I have it set to be. (For example hovering over the mastery bar in game and having a windows bar not only pop up but cover that part of GW2 in fullscreen making it unable to be clicked.) Windows update broke GW2 like this for everyone I know!