Clicking on "create material" completely freezes SketchUp every time, regardless of file

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Have a look here and follow the key combination to get the dialog back.

Preferences Dialog won't open / Explaining the magic key combination

Various dialogs can get lost offscreen, Preferences and Model info being the most common. This can often be fixed by using the magic key combo that has been passed down through the ages by mystics and sages or by anyone who understands the basics of windows key navigation. The magic combination is often written as Press alt and space together, then tap m, then tap any arrow key, then without clicking, move the mouse around until the dialog appears. This combination is easily explained. Alt …