Do you try to export data from a migrated EPi Server installation and all you get is “Exception: There was an error generating the XML document.[Instance validation error: '268435455' is not a valid value for EPiServer.Editor.EditorToolOption.]“? Then I got the solution for you! You have to re-save some of your page properties before you can do that. The migrating tool, or something else, mess up things during the migration process.