Screen zoomed in to top left corner :\

I've started playing BF4 again and its been running great until this evening.

My native resolution is 1920x1080 and the game is also set to 1920x1080 for some reason it flickers at the correct resolution for a split second and then zooms in to the top right hand side of the screen. Its like the game is playing at a far bigger resolution than it should like DSR but I checked and have that disabled.

If I Alt Enter it drops into a window and I can see the whole game but if I try to either enlarge the window or maximise it the game resolution seems to expand more than the actual window.

I've tried tabbing in and out, Alt Enter, switching tasks, restarting the PC but nothing seems to work. I was playing it 2 hours earlier without the issue. However my friend running on Windows 7 had this exact same issue with hardline and he couldn't figure out how to fix it either.

System Specs:

Windows 10 Tech Preview

AMD 8350 @4.3ghz

16GB DDR3 1600

GTX 670 SLi (latest Driver)

Sabertooth 990fx R1.0