Windows 8 and CSS problems (FF 16 & 17)

10-11  Source: Network gathering  Views:0 

I just got a brand spanking new Win 8 computer (intl English). The only things installed on it are Adobe Master's Collection, Steam, Office and Firefox. In addition I tried installing adblocker, because that's a must for me and if this problem is resolved by removing it I will have to switch to another browser.
Now, the problem is that FF is having problems loading pages with CSS. Occasionally, this results in a pages with nothing at all (except background color, it seems) or with just unformatted text. Most of the time this is fixed by doing a shift+reload, but not always. Some times it's just partially fixed and some elements don't load still.
I've tried disabling all extensions and plugins and I've also tried resetting FF. The problem always comes back. I've even tried resetting my hosts file.
Do you have any more ways of fixing it? I believe I've done everything in my power, except change browsers (which I really don't want to do unless it's my only option).
The only thing I haven't tried, which I'll try now, is unpin all my app tabs and see if that fixes anything. I'll update this if I can...
Pages affected: Facebook (some of the time), Couch Potato (installed on my server - never seen this on other computers or even other browsers on my computer, always), MyFitnessPal (occasionally), and some low-tech dating page I'm on.
So, it still happens with a new an clean profile without extensions?
In that case you may have security software (firewall, anti-virus) that block some content.
You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Press and hold Shift and left-click the Reload button.
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (MAC)
You can also try to use the Web Console (Web Developer > Web Console;Ctrl+Shift+K) to see if you can identify network related issues.
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