Hey,
It's a custom built PC I've made which I've had no issues with prior to this.
Motherboard: GA-Z87X-UD3H
CPU : i7 4770k
GPU : GTX 770 MSI
RAM : 32 Gig
O.S : Win 10 (previous o.s Win 7 and Win 8.1)
I've noticed that Nvidia have released a new Win 10 driver set this morning for my GPU but that's not resolved the problem. The Mobo chip set drivers and everything else are all up-to-date with the latest Win 10 build. I'm wondering if one of the fonts didn't install correctly on upgrading to Win 10.
Here's a picture of the issue I'm experiencing, it's most noticeable when using gmail, again this happens using any browser, Edge, Chrome, Firefox and IE.