Problem with echosign signature field no longer allowing user to use mouse to sign

Up until a few weeks ago, the echosign feature was working perfectly in our PDF, and also we had seen the fields working on PDFs on other websites.  Now, the fields aren't working, and you have to type in your name rather than sign inside the field. 

Has something changed?

We have tried this on a number of different PCs and browsers, and internet connections - nothing works!

Thanks

Heather