Gralon - 7:50 am on Oct 2, 2003 (gmt 0)

i see the same thing but in the other way for one of my website.

Got many pages indexed and well ranked by google.
But since 3-4 weeks, many pages lost her "google cached page" and the title become the url.

What does it means? every day i lost visitors from google :-(
the weird thing is, this webpages always have Pagerank (many at 4 or 5) and googlebot visit the website everyday (but apparently the index is not refreshed).

How can i know if there a penality on my website and if so, how to remove it.

Thx