Email link on lead pages doesn't work

Email link on lead pages doesn't work

I have just set up my email in Zoho CRM and can send emails by going to the leads, list view and clicking on the box to the left then clicking on the send mail link. I have tested it and that works fine, but when I open a lead into the page view click on it nothing happens. I am using chrome and have OKed Zoho for popups, I am using professional version on a trial basis.