'Artifacts' on in-game font

[sh77]

Hi there.

I'm experiencing a weird graphical bug where there are artifacts on the in-game font.

Here are some examples of what I'm seeing:-

http://imgur.com/GDm4Zc9

http://imgur.com/UByIzZE

http://imgur.com/cCoJpCZ

http://imgur.com/gLRyuZ8

I could show more but basically, wherever that main font is used, it appears deformed.

I have a GTX 660 Ti with up-to-date drivers. I'm running full-screen at 1920x1200.

Anyone experienced this and know of a fix?

Thanks