Opera text appears as rectangles

Hi I'm using Opera (9.6) I recently added fonts (a few hundred) from my other mac to my new mac, they are essential for my work so can't remove them. I haven't disabled any fonts and all the default fonts are fine, but when I view certain pages the headlines and text are rendered in rectangles. This happens especially with kotaku.com . I have enclosed a window grab to show what I mean. If anyone knows a solution this would be helpful as it renders some site unuseable. I have tried viewing the site with Firefox and it renders fine.

hmmm. I remember having similar problem with IE and WinXp. I believe it either font or language. kotaku.com display fine in my Firefox