An error at Google?

I am hypothesizing that there is a possible error at google. What else could this problem possibly be?

I don't think the page is penalized. Here is why I think this: The rest of the site gets a great amount of traffic. If I was bad in google's eyes, why would they still send me tons of good quality traffic to my deeper pages?

The page is indexed and is PR4, so why not show up in serps for any search phrase (even the most noncompetitive phrase you could think of)

I follow the webmaster guidelines.

I don't think it's a technical issue. If it was technical, I think other search engines would have the same problem. If yahoo and msn could resolve a small tech issues, then why can't the big G?

Could it be possible there is an error at google? My opinion is yes!