I recently revamped an old internal webpage that was in google's cache. I also created some new links from the website's sitewide header section to point to the newly touched up page outlining some new services.
The page now has zero PR and is not in the cache. We dont over optimize, if anything we made sure the page was clear of copy content by using copyscape.
The site maintains its ranking generally, just this page has disappeared from google's radar without a trace. it didnt even go into supplemental! What's even stranger is that the pages subpages are cached?