@slbaumgartner said:
How many components are in the model or the collection you are viewing? I've seen the components window freeze SketchUp (spinning beachball of death) while generating the thumbnails for a large list of components. If I wait long enough, it eventually wakes up. Having a lot of unused components in the model aggravates this problem.
92 components with 3,500 instances. Strange thing is, even with every single component exploded (as an experiment) the same behaviour occurs.