Box may be on the right track: surfing the web turned up a number of people experiencing the same problem. It has been suggested that Windows Update KB40115217 is the cause of the problem.

Now, if only I knew how to uninstall that!

Thanks for your prompt reply, Tig. Installing as a repair hasn't fixed the problem I'm afraid. All other programs are responding to my mouse correctly so I'm convinced there is a Sketchup/Windows10 issue here.

Hallo Leute,
I've been using Make 2016 quite happily now for some months on a Windows 7 machine. I have since downloaded it onto a Windows 10 machine and find that there is a three or four second delay between left-clicking on an object and the blue bounding box appearing. I've tried upgrading to 2017 but get the same peculiar result. Any Ideas?

Thanks in anticipation