Taskbar Issue/Monitor Issue?

[StingGames]

Morning Guys, Yesterday I picked up a new monitor, the 28" samsung 4k LU28E590DS, ever since I plugged it in via displayport my computer has been very laggy. The taskbar won't open on the main screen and on my second monitor it's frozen open. I can't click on any apps or close the taskbar. (I have it so I have to hover over it to open). I'm not really too sure why it's happening or how to fix it. Any help is greatly appreciated.

My graphics card is Geforce GTX 760

[GigabitXe]

My first guess is that it is a driver issue. According to Nvidia's site: "1 - 3840x2160 at 30Hz or 4096x2160 at 24Hz supported over HDMI. 4096x2160 (including 3840x2160) at 60Hz supported over Displayport. Support for 4k tiled MST displays requires 326.19 driver or later."

 

I would check your drivers and see if they are up to date. Also check out this website for addition information for supported resolutions with that card. 

[Praxis727]

Also, go through your taskbar settings as there is settings for multiple displays.