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.
Unless you see a Bug Splat Screen and crash, please allow SketchUp to work through and process the data.
We are looking into possible ways to add a better progress bar for PlaceMaker and hope to include this feature in a future update. Unfortunately, there is no known way to create a proper progress window using a pure Ruby extension like PlaceMaker.