Penalized site only with some keywords, is it possible?

A site with 4/10 PR but still after 500 positions

[Acrol]

I have a site that has got strange problems since it's birth (one year ago).

This site is valid HTML 4.1, tableless, with good H1 H2, 10 links from other sites. Domain is like "www.x-y.biz" where x and y are the keywords to "push up". The site is about "x y", has got some pages but only the HTML (.html) one are cached in Google, the others (.php) have just the URL (have 0/10 PR). The site uses sessions. PR for homepage is 4/10 and is ofter visited by Google.

If I search "x y" on Google this site appears after 500 positions, while for other terms is in first or second page. But for the most important keywords "x y" is like penalized.

Homepage: "x y" are present in title and in the body (9 times), with about 1100 other words (real text for users, not for SEO).

This site has got 3 "brothers" site (same structure, just translated) each one with a different domain for different languages: all these sites are on top positions in Google.

The ONLY different thing with the others 3 sites is the SEO work, the penalized one had a "stronger" work (4 doorpages, links from other sites).

FINAL QUESTION:
Is it possible that Google penalized this site just for "x y" keyword?

[plasma]

- PR won´t be shown when there is a? in the url.
That doesnt mean that these pages dont have PR.

- Doorway Pages? Sounds more like spamming than SEO.

[Acrol]

Doorway Pages? Sounds more like spamming than SEO.

There are 4 pages with some content of the site itself, just with proper h1 h2 and no more, then a "ENTER SITE". Could be "splash pages", where there is a short presentation of the site instead of a Flash intro as used by many sites.
I mean, the aren't pages unrelated to the site, but text introducing the site, grabbed from the site itself, without graphics. DO you think it can be considered "spam" by Google?

[WebWalla]

The site uses sessions.

Google doesn't like session id's, so that may be your problem on the .php pages. Try taking out the session id's if possible.

[claus]

>> Do you think it can be considered "spam" by Google?

No need to think, it's stated clearly here: [google.com...]

/claus

[Acrol]

Hi to all,
maybe I found the problem. Two days ago I removed the session for Google and other SEs. Today one sub page appeared to be fully crowled and the position became better.