Does Y! filter for "hidden" text?

[glengara]

Friends craft site is up over a year but Y! knows nothing about it, granted it has no links, but Y! picked up and indexed another no link site within a week, so there's likely something else.

She's using off white text/links on a coloured bg image over a white background, the page looks blank in the text-only cache in G but the text/links do show up in Lynx.

So I'm wondering if the site has fallen foul of some hidden text filter...