info on page tab missing in admin

[shawn_a]

maybe now you can find which page is messed up

usually its a page that has itself as its own parent.
or a childs parent has the child as parent.
or if one of your pages is missing from the list entirely it is probably the culprit.

The fastest way to find these is to check page cache using the data/other/pages.xml file or the cache info plugin