All the old items in standard-00000 are not more available.

What's going wrong?
BTW: When I'm in the dashboard as admin, I can see and access only articles 100 to 120 (the newest). All the others are not available, but the page indicators has room for all (old) articles: "1 2 3 4 5 ... 6"
But this numbers leads to empty pages...
My phpinfo: http://blog.123soest.de/pivotx/phpinfo.php