I don’t work for Trimble so I won’t try to speak to your first question.
However, your experience is not typical, so there must be something specific to your system that is causing this. Please help narrow down what it might be… What major and minor release of SketchUp are you using (you can get this from the SketchUp->About SketchUp menu)? I assume you have SketchUp installed in Applications (that is, you are not trying to run it from the installation volume)? You say no extensions are “active”, but have you tried renaming the Plugins folder to make absolutely sure? Is this your first ever installation of SketchUp, or have you run it successfully before?