Eric,
Hi, I saw this bug on your site referring to this message :)
The older version of edit-this-page you are using sometimes lists content from other packages that store content in the -100 root folder.
THis is because ETP does not subtype content-revision.
I fixed this in newer versions of edit-this-page. There is an upgrade script that _should_ fix it, but if you made any changes or added new content types it might not work, so please test it on a backup of your database first.
