CRM button not working when I try to add new enquiry/contact

CRM button not working when I try to add new enquiry/contact

I have zoho mail with my paid version of CRM. For the last couple of days the drop down from the CRM button (at bottom) is blank and I cannot add new people who email me as a contact/enquiry. I have sent an email to CRM support but have not had a response so wonder if this is better addressed by zoho mail.