If Medal looks something like this, you may have Nvidia's Image Sharpening enabled.
Image Sharpening has been known to affect some programs in weird ways.
To disable Image Sharpening:
1) Open NVIDIA Control Panel by right-clicking in a blank area on your desktop
2) Click Manage 3D Settings
3) Go to your Global Settings and Image Sharpening to Off then click OK
4) Click Apply in the lower right of the NVIDIA Control Panel to apply your changes