Please be patient. The process to import the data and modify it for SketchUp can take a few minutes. If you are importing onto a very large surface, and there is lots of data, the import can take quite awhile, even hours.
Unless you see a Bug Splat Screen and crash, please allow SketchUp to work through and process the data.
Due to limitations with SketchUp itself, it is not possible for us to display a progress bar window during the import process.