Several Sketchup Bugs

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You may find some useful information in this Sierra thread.

SketchUp and macOS Sierra

Hi all~ Edit 10/3/2016: We have released SketchUp 2016M2 to address the worst of the issues on Sierra. Just a reminder that the newly announced (and not yet released) macOS Sierra is not officially supported by SketchUp - if you’re a person who loves to install beta software versions, be aware that SketchUp may exhibit all sorts of unwanted behavior. I ALWAYS recommend installing beta OS versions on separate partitions or removable drives so that you can revert to a known-good OS as necessary…