Enable current viewpoint bug?

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I haven't had that issue (though i've had a similar issue), but here's a way to work around the issue. This method requires your map to already be saved to a .map file. You're going to have to edit your map in a plain text editor. In Level::ViewportConfig, you're going to see two attributes, one called SelectedViewport and another called UsingEnlargedViewport. Make sure SelectedViewport has a value of 3 and UsingEnlargedViewport has a value of true. Save the file, restart the level editor and open your map.