Zoho calendar and Zoho Event integration - Look ups broken again..

Zoho calendar and Zoho Event integration - Look ups broken again..

Since yestrday, 18.5.16 the look up link between zoho mail and zoho crm events is not working again.
This has happened before some months ago and the problem was zoho end and you did fix it. (You should have the records to refer to).  The pop up panel to select the lead or contact... pops up and when you select with the hand, nothing happens!!

The work around is adding event in zoho crm  and it will pull through, but often calendar appontments are booked whilst in in zoho Calendar, with other activities and is a fundamental link which needs restoring. Please can you fix again and confirm when okay.
Many thanks
Eileen
Eileen Murphy - MD of Informed Training