Life is good again. Sandboxie opens Chrome like a bullet. No problems.
A very sad RIP to a beloved old friend after many years of close companionship - bye, bye Opera.
Perhaps in the distant future I will check Opera again, but Chrome is a magnificent browser, very much like Opera in many ways.
I have used Chrome in the past as my default browser and only changed to Opera because Chrome dumped support for XP. No support problems now with Windows 10.