Report builder screen never comes up when trying to create a pivot type report

Report builder screen never comes up when trying to create a pivot type report

I am trying to create a pivot table report with Creator. 
I select New - Report - put in the report name, type is pivot, based on ..., where to store it and click on the create
button. 

All I get is three flashing dots. 
I let it run for over an hour and still only had the three flashing dots. The report builder screen never came up.
I tried it again on a very small table (18 rows) and got the same result. 

I've tried it logged into Zoho with the owner's sign on and with a developer's sign on. 
Same result. Just hangs on the initial screen and never brings up the report builder screen.

I am running this using Chrome. 
Thanks.

Jim K.