If I hide scene tabs by way of View > Scene Tabs, after saving a file and closing, when I restart SketchUp this state is not remembered and my scene tabs are showing even though in the View menu Scene Tabs is not ticked.
If I click on the unticked Scene Tab menu item it ticks itself. I can then untick it and Scene Tabs are turned off.
SketchUp is installed correctly - right clicking on the exe file and running it as administrator