taskbar task preview

I got a new monitor for Christmas and now every time I launch a game, the taskbar hover live preview breaks. It's fixed when you open the tab, but it's very annoying. After opening a game my taskbar looks like this for every program. The new monitor is a Viewsonic XG2402. I'm not sure why...

Firstly, I'm not referring to the way you click the far right bottom corner of the taskbar to get a 'peek'; i'm referring to the small window that pops up when hovering mouse cursor over a task in the taskbar. In Windows 7, i could go into Performance settings and uncheck the controlling box and...