Site Title, Tagline & Main Menu fonts are 'pulsing'

Hello, this is a strange one (at least I think?).

The fonts for Site Title, Tagline & Main Menu are 'pulsing'. Meaning, they go from being thin to bold and then back to thin, then back to bold - very strange. Any idea what would cause this?

It is the same effect you see when the Frontpage first loads, and the fonts come in thin and then get bolder, but after the page loads, they continue to go from thin to bold, thin to bold, etc., instead of just staying bold (and by bold, I don't mean they are actually in 'bold' format, but they are thicker than when they first load).

This goes on continuously on my Mac, and was also doing it on my iPhone and iPad, but for some reason it now only happens on my Mac. After adding some new pages, the fonts do not behave this way on those pages, only the Frontpage - and only those particular items (Site Title, Tagline & Main Menu).

Any help, once again, much appreciated!!!

Just uploaded a new featured image for 'About Us', which was the original 'Our Team' page from the Quark demo and it is now doing it on that page as well. Just checked the Demo site (and page) on Gavick.com and it is doing it there as well.

Hello,
I can't see this issue, which browser exactly are you using on your Mac?

Version 7.0.3 (9537.75.14) w/ OS 10.9.2 - this is happening again on my iPad as well.

I've checked Safari version 8.0.4 (10600.4.10.7) and version 7.0.6 and can't see this issue, probably it's a problem with fonts rendering by the browser engine but unfortunately we don't have any influence on that.

Ok, I will upgrade my Mac soon and test, thank you. Would this be the same for the iPad as well? I am on OS 7.0.4 (11B554a).