when we first had the forum some people said they saw white on white others white on black. I finally figured out the problem. If your resolution is too low than you will see the white on white as the smaller you make your browser box some reason the text moves.
Full Screen:
Smaller Screen:
Even Smaller Screen:
Why it does this? I'm not sure but if you set your computer to a higher resolution you will have better results not only for the forum but for the website as well.