Invisible fonts on some menus

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https://bbs.archlinux.org – Ok, after googling for nearly 1 hour (I tried every single combination of fonts invisible, linux fonts invisible, dropdown invisble, etc...) I'm lost.When I click on a dropdown menu on a website, the font colour is exactly the same as the background, thus rendering the text invisible until I select it. On deselection it's invisible once again.The same goes for PlayonLinux, when asked which steps I would like to perform on a newly created device (like "use winetricks"), etc... . Also some websites have invisible buttons for me, ok, well, I see a white square, but with no tex (HowTos)