I'm not much of a meeting  workspace guru, but might it be the standard "new
content needs to be checked in (or approved)" scenario?

I don't think there's an approval requirement. These are "pages" in
a page  library which is a little different from web part pages  that
are documents in a document library.

For example, in the meeting  workspaces, you can even create a web
part page; the option does not appear in the create menu.

Have a look at this. It appears that the new page  is checked out by default,
and that checking it back in fixes the problem..

www.eggheadcafe.com/.../multipage-meeting-site-p
r.aspx

The Egghead post sounds like exactly what's
happening.

Two Questions: My guess is that you can get to the settings to the
page library where the tabs pages  live IF you know the url. That
will be something like:

http://MySharePointSite/_layouts/listedit.aspx?List=%7B7EE6E8FE%
2DD6B4%2D485B%2DB0C5%2D282A416FF272%7D

...Where that GUID is the GUID for the library. If I knew how to
figure out the GUID for the library, I could hack it into place.

Another question is that the Egghead guys thought to look at the site
content and structure page  and use it to check the pages in. Mine is
on a WSS site so, alas, no Site Content and Structure page.

The SPD thing seems like it might have some answers.