It seems that now the login credentials form appears on the page AFTER login. So, clicking the account person icon it updated to show my name and I could use the dropdown to access the dashboard. Very unintuitive, but I'm in.
1. open https://www.isc2.org/
2. on site member/ member dashboard
3. opening login panel. enter login /password (https://my.isc2.org/s/login/?ec=302&startURL=%2Fs%2Fdashboard)
login accepted (for testing using wrong password - error message)
4. in address area of browser readdress to dashboard, but second later readdress to login template