Incorrect DPI/scaling of desktop on ONE monitor

Hi guys. I currently have a two monitor set up.

On boot up the left monitor (desktop only, metro is fine) has incorrect DPI scalling, where some items appear large and blurry. This includes the menus (eg explorer), desktop programs and the cursor. The taskbar and metro interfaces are fine.

Changing any graphics settings fixes the problem - eg. if I change the main monitor and change back the problem goes away. Equally, changing resolution and changing back fixes the issue. I've only ever had the problem with 8.1. I fixed the problem/it went away after a while, but since doing a reformat the problem is back.

I have changed the setting in text size and other items, unchecking the "let me choose one scaling level...." and have put the slider on "smaller". In PC settings, the DPI is set to smaller (but this is for the metro interface).

Would appreciate any help!

Thanks, Alex

What is the manufacturer & model of the monitor. I take it that it is the GPU in your spec's that is the issue.