I installed and tried to run the P2PConverter to convert posts to pages. It failed, and I have uninstalled the plugin, but I have a lingering problem: in the admin panel, the lists of pages and posts are missing. That is, if I click on posts->all, I get a "page not found" error. I have re-uploaded all of the WP 3.2.1 files, and they're still missing. I tried to run upgrade.php again, even, and it just says my site doesn't need upgrading. How can I restore those pages?