SOLVED: Instead of the using the updater I uninstalled Dorico completely and then installed using the Steinberg download assistant.
I have been using version 2.2. for a few weeks and all is well, EXCEPT: look at the bracketing tool (see graphic).
John Barron suggested I reinstall. I tried, twice, but it always says the installation failed: “An installation package for the product Steinberg Dorico 2 cannot be found. Try the installation again using a valid copy if the installation package Dorico2.msi.”
However the program does work (as version 2.2) but the bracketing tool is still wrong, as above.