I created a brand new WordPress site.

I imported the export *.xml from my old site.

Now, when I go to "Add New Post", there is an old post in there, and I can't seem to do anything without getting an InvalidID error.

Here's a look:

FWIW, the entry that shows up has a very large ID value: 9223372036854775809

ADDED: It also happens on my "Add New Page" screen.