If using Safari, you may need to enable the WebGL to begin the tour. If so, it’s easy to do, simply:
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• While in the Safari browser, go to the top left and click the SAFARI tab > then click PREFERENCES.

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• While in the PREFERENCE window, click the ADVANCED tab (top right tab in the preferences window).

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• At the bottom of the preferences window, click Show Develop menu in menu bar > then close the preferences window.

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• At the top of your screen, while in the Safari browser, the tab DEVELOP will appear between Bookmarks and Window.

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• Click DEVELOP and scroll down to ENABLE WEBGL (second choice from bottom).

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• Once done, refresh the page, and the 3D Virtual House Tour will load.