Call Start Time cannot be empty

Call Start Time cannot be empty

Hello all,

Having made a call through the Zoho iPhone app, I then (as I have previously) entered Zoho to Edit the Call but I am now unable.  The " *Call Start Time" requires an entry but the field is unavailable (I can't click in it and it won't accept "Today") and therefore I am unable to enter a date.  Additionally if I try to Save the Call I am greeted with the following error message "Call Start Time cannot be empty".

Seems I'm caught in a loop, can anyone offer advice?

Cheers