Version: 1.74.3. Oanda V20 connection is broken.

I had set up the Oanda V20 connection in version 1.66.5 and it's working fine in live trading.

With the same Accounts.csv file copied over to version 1.74.3, selecting the same Oanda Account and choosing Oanda V20 plugin, Zorro always reports:
Login Oanda V20..
Can't connect!

The symptom is the same for any strategy script as well as the Download.c script.