Try tapping the blog URL and re-selecting it to see if that fixes the error. Should be fixed for the next version. (Bookmarks are also coming back but aren't in 3.0.)

@manton 3.1 has a new structure for saving preferences and there was a bug in the beta in the migration process. What @manton is suggesting basically resets the preferences to the new structure.

@cheesemaker @manton Thanks both, all good.