Just installed 4.6.5 SP1. Works great so far. Went into the menu items to remove the "Contact Us" item, and when I clicked on "Unpublish", I received an error:

mosmenu::store failed
Incorrect integer value \\\'\\\' for column \\'published\\' at row 1
SQL=UPDATE mia_menu SET menutype=\\\'topmenu\\\'
name=\\\'Contact Us\\\' link=\\\'index.php?option=com_contact

Line breaks provided by me. I'm sure there's more, but that was all that showed in the box.

From poking around at the "Contact Us" item in the main menu, it shows the Type description in red (can't remove because it's required for correct operation), in the top menu, it's shown in green (do whatever you want). I would guess that there is a safety check to keep the item (and similar) from being removed.

I was able to put both in the Registered access, but I'd still like to be able to unpublish it. I would request either the Type be made red (if it's indeed needed for correct operation) or the safety check be removed.

Thanks,