macuser_22 THANK YOU!!!
I waited longer than I had before and bingo the print dialogue came up! I tried watching the Activity Monitor while it waited but didn't see anything else much occupying CPU time.
Incidentally I had tested TT Home and Biz 2019, 2018, 2017 on this Mac with same result. And 2016 on an older Mac with older operating system - again same result.
