Cannot remove one Page from page menu

Athaulpa 3.7.5
WP 3.3.2

Page menu bar has a page in it which is not yet ready and I simply cannot make it go away.
Here's what I have done so far:
1) Added the page number to the "Exclude pages from Page Menu Bar" box
2) I use the pageMash plugin for purposes outside of Athualpa, and I have "hidden" the page using that plugin
3) I have changed the visibility of the page to Private.
4) I have changed the status to "Draft"

I suppose I could just send it to trash and build it again later, but I'd rather learn what I am doing wrong.

TIA

Zip