We are on Drupal core 6.2 (yes I know need to upgrade) and upgraded CKEditor to 6.x-1.14 (with the 4.1 base). Now the ability to create a new "Page" has disappeared and all of the old Pages are showing the "Type" as blank when viewing the list of published/unpublished items. Some screen shots here to help visualize:
http://www.caenyc.org/images/no-page.png
http://www.caenyc.org/images/blank-type.png

We did disable forums recently so I looked at this thread which suggested:

The cause might be having multiple records in the menu_links table where the router_path is "node/add" (in Drupal 6).

I looked out at the database with PHPMyAdmin and couldn't quite tell if this was our problem.

What I did find in the menus were duplicate lists and content type. Here are some screen shots.
http://www.caenyc.org/images/dupe-node-list.png
http://www.caenyc.org/images/dupe-content-templates.png

I also rebuilt permissions. What'd I mess up?

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I just saw this in Reports --> Recent Log Entries

Type: php
call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'page_node_form' was given in /home/content/c/a/e/caenyc/html/includes/form.inc on line 378.
Backtrace:
call_user_func_array(a:2:{i:0;s:14:"page_node_form";i:1;a:2:{i:0;a:3:{s:7:"storage";N;s:9:"submitted";b:0;s:4:"post";a:0:{}}i:1;O:8:"stdClass":43:{s:3:"nid";s:2:"28";s:4:"type";s:4:"page";s:8:"language";s:0:"";s:3:"uid";s:1:"1";s:6:"status";s:1:"1";s:7:"created";s:10:"1233560337";s:7:"changed";s:10:"1366743648";s:7:"comment";s:1:"0";s:7:"promote";s:1:"0";s:8:"moderate";s:1:"0";s:6:"sticky";s:1:"0";s:4:"tnid";s:1:"0";s:9:"translate";s:1:"0";s:3:"vid";s:2:"28";s:12:"revision_uid";s:1:"8";s:5:"title";s:20:"Principals Institute";s:4:"body";s:10085:"