OpenStudio orange/red bars, freezing and crashing

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I am creating my building geometry with FloorspaceJS, and when assigning attributes to the spaces, the bar beside 'Preview OSM' turns orange. After that, the app gets very slow, and then the bar turns red, after which it is completely frozen. Sometimes when I reopen the file, the floorplans I created are gone. I have a good graphics card, so that is not the issue. I am also using the latest version of OpenStudio. Any ideas why this might be happening?