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Our most important page in the Google index (a subfolder index page) which ranks well for very competitive terms and which Google shows 3500 backlinks has suddenly gone missing for all keyword searches other than the most competitive keyword where it remains in the same position but is listed as URL only with no further info or snippet or cache. It is not now listed in a site search but retains a PR6 on the Google toolbar. It cannot be found by seaching for the URL.
All other pages remain properly indexed and rank very well including our homepage.
Most odd, any similar experiences or ideas our there....
In the past things like this were temporary - I expect the same with the current strangeness.