Sitemap tool: page properties - error alert with no message

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I'm adding a new page to my site. To get it to show up in my subnav, I've gone into Concrete 5 Dashboard : Sitemap : myPage : Properties : Custom Properties and checked 'Top Sub Navigation'. (This is how all my other pages are set up).

When I go to Save, I get an alert dialogue popping up with no text in it telling me what's wrong (see attachment). If I uncheck the box I can save, so there's something about this page that won't let me set Top Sub Navigation.

Ideas?

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DaveC426913
 
DaveC426913 replied on at Permalink Reply
DaveC426913
:sigh:

That was in FF. Tried the same thing in Chrome and it's fine.

So problem went away, but I never found out what Firefox was complaining about...