Error on: "Optimizing property sets for mapping code"

Hello,

I noticed that an object is not listed in the NameMapping / Mapped Objects window but is listed in the Object Browser.  So I attempted to map it "TextNode(0)", with the intention to drag it into the Aliases window.  I right-clicked to try both:  Map Object and Map Child Objects options.  As you can see from the 1st image, the message reads "Optimizing..." and it stays there for a very long time, more than 5 mins.  TC doesn't complete the optimization or mapping. 

Am I missing a step prior to object mapping TextNode(0)?  In the Chrome browser, it is physically represented as the Divisions option in the View drop-down box.

The fully qualified object name is:

//Aliases.browser.pageIsmadsQaTestVestcomComAdminA.Panel(0).Panel("content").Panel("masterdatasection").Panel(0).Panel(0).Panel(0).Panel(0).TextNode(0).Parent

Thanks,

Arlene