A short time ago my Select arrow began displaying select highlights as shown in attached jpg.
This only appears during the select process and disappears once selection is complete and mouse button is released. Selection appears highlighted normally.
This is a graphics card/driver issue. Try updating your graphics drivers and make sure
SketchUp is not using the integrated Intel GPU. The fact that this just started happening for you implies that an update to your graphics drivers, pushed automatically with a Windows update, has broken the drivers. No an unusual occurrence, unfortunately.
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Went into Device Manager, updated t driver for my Nvidia graphics card and then rebooted. Checked to confirm that an Nvidia driver was being used by system. That blocky garbage is still showing when I use Sketchup’s Select arrow tool.
This would indicate that your graphics card is old enough to not support the required OpenGL version correctly. Turning off Hardware Acceleration makes the CPU take over for the inadequate GPU. As long as you stick with SU2016, you should be fine though.
Before trying that, try only turning off “Fast Feedback”. It might help with a minimal decrease in performance. Disabling hardware OpenGL results in very slow zooming and orbiting in all but very small models.