I am finding that negative rules do not protect some pages selected for exclusion

I’m using BuddyPress and the BuddyPress Corporate theme — up-to-date on versions.

I have a “Visitor” level defined for anyone not logged in. I have a negative rule for Menu for Visitor that shows Login, Welcome Visitor, and About. To ensure access control, I have also created a negative rule for Pages that prohibits access to all pages except Login, Welcome Visitor and About. This all seems well and good until, testing as an un-logged-in visitor, I manually type into my browser’s URL field: mywebsiteurl/account. I’m dismayed to find that the unloggedin visitor is now taken to my Account page (which, obviosuly, is checked off in the listing of prohibited pages in the negative rule for Visitor). Yikes!

Does anyone have any ideas on how I can fix this?